20 pk Clear Bobbin 136492-001 (SA155) - Baby Lock, Brother, Bernina, Riccar" /> A 20-pack of genuine transparent sewing machine bobbins. Baby Lock part number is 136492-001 and Brother part number is SA155. These bobbins are 3/8" depth, high quality clear plastic and are for use in many of Baby Lock and Brother sewing and embroidery machines. Please check your manual to verify which bobbin style is right for your machine.