Coats Ultra Polyester Bobbins #U Size 138 Black (144 pack)

The Coats Ultra Polyester Bobbins, specifically the U Size 138 Black, are designed for demanding applications like luggage, footwear, leather goods, outdoor goods, marine applications, seat trims, and upholstery. Made from high tenacity continuous filament polyester, these pre-wound bobbins offer 20-33% higher strength than typical lubricated sewing threads. Their heat-set threads reduce stretching and shrinkage, while a bonded finish prevents ply untwisting and reduces fraying at the needle eye, ensuring improved seam quality. With a break strength of 21 lbs and recommended needle size 22/24, they're ideal for tough manufacturing conditions. Each pack contains 144 bobbins, making them a go-to choice for commercial sewing and industrial applications like furniture upholstery, marine upholstery, automotive seat trim, and more.