A: 15D/1F Nylon 6 high twisted monofilament yarn are also be named nylon 15D/1F textured yarn or Crystal Yarn. B: This Yarn is twist "Z" and twist"S" C: Be used together to produce textured "crystal" socks. D: 400 TPM "S" or " Z" E: We can adjust the technical data basis on your requirment. Packing Size: Net Weight: 1.10kg---1.30 kg/steel bobbin Grows Weight; 0.38 kg/steel bobbin Carton Size: 42 cm X 42cm X 38 cm Quantity: 16 steel bobbins/ carton, 8 " S" twisted + 8 " Z" twisted /Carton About 7500 kg yarn / 20'ft