Standard size bobbins：

Approx. 2 * 1 cm/0.78*0.2 inch (diameter x height). The standard size can be employed on most sewing machines, like Singer / Babylock / Janome / Pfaff / Prewound / Futura.

 Easy to carry：
The singer bobbins are enclosed in a transparent plastic box, each bobbins in a separate position, very organized.

 High-quality：
These transparent bobbins are made of plastic, durable, practical, smooth without a burr, will not scratch the line. High-quality plastic tubes that can easily wrap the line on it without breaking.