Genuine Janome Accessory. Each bobbin contains 80 yds. of 100% Spun Polyester Bobbin Thread, on a clear plastic bobbin, weight 60/2. If you want to spend more time creating, and less time stopping to wind bobbins in the middle of your project prewound bobbins are you answer! Janome pre-wound bobbins are manufactured to give you the best possible, highest quality stitching. We precision-wind them with 100% spun polyester bobbin thread on clear spools. They feed smoothly and don’t cause lint. Best all, you spend more time sewing and less time winding! Convenient 108 count box.