MULTI-QUANTITY: The bobbins forsewing machine package includes 50 transparent plastic bobbins, two transparent storage sewing bobbins case, great sewing machine accessories. STANDARD SIZE BOBBINS: Approx. 2 * 1 cm/0.78*0.2 inch (diameter x height). Standard size compatible with most household sewing machine, like brother, babylock, janome, singer etc. Please confirm the tube size specifications on the user's product manual. HIGH-QUALITY: These transparent bobbins are made of plastic, bobbins forsewing machine, durable, practical, smooth without a burr, will not scratch the string. High-quality plastic tubes that can easily wrap the line on it without breaking. EASY TO CARRY: The bobbins are enclosed in a transparent plastic case, eachbobbins in a separate position, bobbins for singer sewing machine very organized. Protect the bobbins and convenient to carry.