Owning them, strings won't let you confused again.
Plastic Spools, Wheel, WhiteSize: bobbin: about 38mm in diameter, 45mm high; backplane: 68mm in diameter, 2mm thick, hole: 14mm.These plastic spools are very hard without much weight, so they are not easy to crush. Plastic Spools Generally, they can be used to roll a variety of thread, wire and chain..