Quilting Machine which is special and professional machine for bedding shell fabric. Usually we recommend use 150D/3 & 210D/3 (High tenacity polyester thread) as the top thread and 300D or 40S/2 & 40S/3(Spun polyester thread) as the bottom thread StandardDiameterGross weightNet weightLength 150D/3 0.29mm1000g 9000g17200m 150D/3 0.29mm 500g 450g 8600m 210D/3 0.31mm1000g 900g 13800m 210D/3 0.31mm 500g 450g 6900m 300D 0.19mm500g 470g 12800m 40S/2 0.18mm400g 380g 11500m 40S/3 0.22mm400g 380g 8500m