Style G / Size 138 bobbins are typically used with topstitch threads that are size 207 and higher.
Size 138 - Style G bobbins are typically used in small and mid-sized commercial sewing machines for sewing garments, fabrics, leather, and upholstery. They are 0.390 inches (0.861 cm) high and 0.991 inches (2.187 cm) in diameter.
Information
Code Description Image Price Stock  
BOBG138WHIT072Na Bobbins - Style G - Size 138 - White (A&E) - Nylon - Sideless - Box of 72 $35.00 26
BOBG138WHIT144Pt Bobbins - Style G - Size 138 - White (Service Thread) - Polyester - Sideless - Box of 144 $76.00 4
BOBG138BLAC144Pe Bobbins - Style G - Size 138 - Black (Eddington) - Polyester - Sideless - Box of 144 $54.00 13
BOBG138BROH144Nh Bobbins - Style G - Size 138 - Brown (Heminway) - Nylon - Monocord - Sideless - Box of 144 $30.00 12