... fastest r.p.m 3.use for industrial closing machines 100% spun polyester sewing thread 12/4 Weight/cone: 200~250g, 8oz, 1~10kg, 4 ... meet all brand machines the fastest r.p.m..Our products can distinguish mainly with 2 lines:1. Small cones for portable closers ... meet all brands portable closers usages. 2. Industrial closing machines: Cone weight 1kg, 2.5lb, 2 kg, 4.5lb, 5lb, 3kg, 4kg, 5kg, 18lb ...