Small spools about $11. Heavyweight thread. Typical uses include auto upholstery, furniture upholstery, boat covers, awnings, tarpaulins, and saddles and horse tack.
https://www.thethreadexchange.com/miva/graphics/00000001/juniors2.jpg For thread size 207, use a size 140/22 to 180/24 needle.
For thread size 277, use a size 180/24 to 220/26 needle.
For thread size 346, use a size 220/26 to 260/28 needle.
For thread size 415, use a size 260/28 to 330/30 needle.

New! All Groz-Beckert Machine Needles and C.S. Osborne Hand Sewing Needle Kits
Information
Polyester Thread Buying Guide
Code Description Image Price Stock  
BPT207BEI102Ba Polyester - Size 207 - Beige (A&E 35874) - Bonded - Nominal 2 Oz Spool - 260 Yards $9.58 4
BPT207BEI104Ba Polyester - Size 207 - Beige (A&E 35874) - Bonded - Nominal 4 Oz Spool - 525 Yards $11.63 13
BPT207BEIX02Be Polyester - Size 207 - Natural (Eddington 001) - Bonded - Nominal 2 Oz Spool - 262 Yards $9.25 4
BPT207BEIX04Be Polyester - Size 207 - Natural (Eddington 001) - Bonded - Nominal 4 Oz Spool - 525 Yards $11.25 9
BPT207BLA104Bn Polyester - Size 207 - Black (Amann USA 7020) - Bonded - Nominal 4 Oz Spool - 525 Yards $11.25 12
BPT207BLAC00Ba Polyester - Size 207 - Black (A&E 35907) - Bonded - 3 x 40 Yard Coils (120 Yards) $5.25 410
BPT207BLAC02Ba Polyester - Size 207 - Black (A&E 35907) - Bonded - Nominal 2 Oz Spool - 262 Yards $9.58 3
BPT207BLAC02Be Polyester - Size 207 - Black (Eddington) - Bonded - Nominal 2 Oz Spool - 262 Yards $9.50 8
BPT207BLAC02Bt Polyester - Size 207 - Black (Service Thread) - Bonded - Nominal 2 Oz Spool - 262 Yards $9.50 9
BPT207BLAC04Be Polyester - Size 207 - Black (Eddington) - Bonded - Nominal 4 Oz Spool - 525 Yards $11.50 6
BPT207BLUN02Be Polyester - Size 207 - Navy (Eddington 6085) - Bonded - Nominal 2 Oz Spool - 262 Yards $9.50 8
BPT207BLUN04Be Polyester - Size 207 - Navy (Eddington 6085) - Bonded - Nominal 4 Oz Spool - 525 Yards $11.50 7
BPT207BLUP02Be Polyester - Size 207 - Dark Navy (Eddington 6085) - Bonded - Nominal 2 Oz Spool - 262 Yards $9.50 7
BPT207BLUR02Ba Polyester - Size 207 - Royal Blue (A&E 35971) - Bonded - Nominal 2 Oz Spool - 262 Yards $9.58 1
BPT207BLUR04Ba Polyester - Size 207 - Royal Blue (A&E 35971) - Bonded - Nominal 4 Oz Spool - 525 Yards $11.63 10
BPT207BRO102Ba Polyester - Size 207 - Brown (A&E 37467) - Bonded - Nominal 2 Oz Spool - 262 Yards $9.58 5
BPT207BRO104Ba Polyester - Size 207 - Brown (A&E 37467) - Bonded - Nominal 4 Oz Spool - 525 Yards $11.63 11
BPT207GRA102Ba Polyester - Size 207 - New Gray (A&E 69197) - Bonded - Nominal 2 Oz Spool - 262 Yards $9.58 13
BPT207GRA104Ba Polyester - Size 207 - New Gray (A&E 69197) - Bonded - Nominal 4 Oz Spool - 525 Yards $11.63 13
BPT207GRAA02Ba Polyester - Size 207 - Silver (A&E 35835) - Bonded - Nominal 2 Oz Spool - 262 Yards $9.58 3
BPT207GRAA04Ba Polyester - Size 207 - Silver (A&E 35835) - Bonded - Nominal 4 Oz Spool - 525 Yards $11.63 7
BPT207GR1404Bn Polyester - Size 207 - Charcoal Gray (Amann USA 7115U) - Bonded - Nominal 4 Oz Spool - 525 Yards $11.25 11
BPT207GRAN02Be Polyester - Size 207 - Nickel (Eddington 8115) - Bonded - Nominal 2 Oz Spool - 262 Yards $9.25 5
BPT207GRAN04Be Polyester - Size 207 - Nickel (Eddington 8115) - Bonded - Nominal 4 Oz Spool - 525 Yards $11.25 7
BPT207GRBW02Ba Polyester - Size 207 - Gray #3- Bonded - Nominal 2 Oz Spool - 375 Yards $8.81 6
BPT207GRE104Bt Polyester - Size 207 - Green (Service Thread) - Bonded - Nominal 4 Oz Spool - 525 Yards $11.50 7
BPT207GREN02Be Polyester - Size 207 - Neon Green 101 (Eddington) - Bonded - Nominal 2 Oz Spool - 262 Yards $9.50 1
BPT207GREN04Be Polyester - Size 207 - Neon Green 101 (Eddington) - Bonded - Nominal 4 Oz Spool - 525 Yards $11.50 7
BPT207ORA204Ba Polyester - Size 207 - Orange (A&E 69221) - Bonded - Nominal 4 Oz Spool - 525 Yards $11.63 10
BPT207ORAN02Be Polyester - Size 207 - Neon Orange 105 (Eddington) - Bonded - Nominal 2 Oz Spool - 262 Yards $9.50 2
BPT207ORAN04Be Polyester - Size 207 - Neon Orange 105 (Eddington) - Bonded - Nominal 4 Oz Spool - 525 Yards $11.50 4
BPT207REDC04Be Polyester - Size 207 - Cherry Red (Eddington 16186) - Bonded - Nominal 4 Oz Spool - 525 Yards $11.50 6
BPT207REDT04Be Polyester - Size 207 - Bright Scarlet (Eddington 2003) - Bonded - Nominal 4 Oz Spool - 525 Yards $11.50 5
BPT207WHIN04Bn Polyester - Size 207 - Nat. (Dull) White (Amann USA 7003) - Bonded - Nom. 4 Oz Spool - 525 Yards $11.25 10
BPT207WHIT02Ba Polyester - Size 207 - White (A&E 30001) - Bonded - Nominal 2 Oz Spool - 262 Yards $9.58 7
BPT207WHIT04Ba Polyester - Size 207 - White (A&E 30001) - Bonded - Nominal 4 Oz Spool - 525 Yards $11.63 3
BPT207WHIT04Be Polyester - Size 207 - White (Eddington) - Bonded - Nominal 4 Oz Spool - 525 Yards $11.50 6
BPT207YEL102Ba Polyester - Size 207 - Yellow (A&E 69248) - Bonded - Nominal 2 Oz Spool - 262 Yards $9.58 8
BPT207YEL602Ba Polyester - Size 207 - Gold (A&E 37426) - Bonded - Nominal 2 Oz Spool - 262 Yards $9.58 2
BPT207YEL604Ba Polyester - Size 207 - Gold (A&E 37426) - Bonded - Nominal 4 Oz Spool - 525 Yards $11.63 8
BPT207YELL02Be Polyester - Size 207 - Neon Yellow (Eddington 103) - Bonded - Nominal 2 Oz Spool - 262 Yards $9.50 1
BPT207YELL04Be Polyester - Size 207 - Neon Yellow (Eddington 103) - Bonded - Nominal 4 Oz Spool - 525 Yards $11.50 6
BPT207YELN04Be Polyester - Size 207 - Lemon (Eddington 4005) - Bonded - Nominal 4 Oz Spool - 525 Yards $11.50 8
BPT277BRO102Ba Polyester - Size 277 - Brown (A&E 37467) - Bonded - Nominal 2 Oz Spool - 187 Yards $9.58 2
BPT277BRO104Ba Polyester - Size 277 - Brown (A&E 37467) - Bonded - Nominal 4 Oz Spool - 350 Yards $11.63 11
BPT277WHIT02Be Polyester - Size 277 - White (Eddington) - Bonded - Nominal 2 Oz Spool - 187 Yards $9.50 2
BPT277WHIT02Bt Polyester - Size 277 - White (Service Thread) - Bonded - Nominal 2 Oz Spool - 187 Yards $9.50 1
BPT277WHIT04Be Polyester - Size 277 - White (Eddington) - Bonded - Nominal 4 Oz Spool - 375 Yards $11.50 6
BPT346BLAC02Be Polyester - Size 346 - Black (Eddington) - Bonded - Nominal 2 Oz Spool - 162 Yards $9.50 1
BPT346BLAC04Be Polyester - Size 346 - Black (Eddington) - Bonded - Nominal 4 Oz Spool - 325 Yards $11.50 3
BPT346BLTY04Ba Polyester - Size 346 - Blue (A&E 69722) - Bonded - Nominal 4 Oz Spool - 400 Yards $11.63 2
BPT346WHIT02Be Polyester - Size 346 - White (Eddington) - Bonded - Nominal 2 Oz Spool - 167 Yards $9.50 3
BPT346WHIT02Bt Polyester - Size 346 - White (Service Thread) - Bonded - Nominal 2 Oz Spool - 167 Yards $9.50 8
BPT346WHIT04Be Polyester - Size 346 - White (Eddington) - Bonded - Nominal 4 Oz Spool - 325 Yards $11.50 8
BPT346WHIT04Bt Polyester - Size 346 - White (Service Thread) - Bonded - Nominal 4 Oz Spool - 325 Yards $11.50 2
BPT415BLAC00Ba Polyester - Size 415 - Black (A&E 35907) - Bonded - 3 x 30 Yard Coils (90 Yards) $6.25 493