FeaturesWorks with machines using size A, Style A, Class 15, Class 15J, SA156, Brother Size 11.5 bobbins.Multi Colors, 11 colors with 8pcs each, 16pcs Black color and 40pcs White color. Totally 144pcs bobbinsStronger and thicker 40S/2 thread, best for sewing purpose or thicker thread embroidery40S/2 spun polyester, Multi Colors, APM40S/2, Weight (WT) 34, Tex 30, Denier 270Compatible with most Babylock, Berenia, Brother, Janome, Juki, Singer models and more others