Madeira's Prewound L Style Bobbins are great if you work on multiple projects or need to re-stock your supply. These prewound bobbins come 144 to a case and contain 132-yards of thread on each. The thread is made of 100% continuous filament polyester. Not only are these bobbins ready to use out of the box, but they are wound with the quality and durability you expect of Madeira thread.