Specification:Name: 1M Worm GearMaterial: Blue Nylon (Plastic)Teeth: 15/20/25/30/35/40/50/60 /80 TeethSpeed Ratio: 1:15/20/25/30/35/40/50/60/80Screw: 2*M41M Worm Rod (Click to visit the 1M Worm Rod link)Note:1.The modulus represents the model, and the computer virus equipment and bug rod can solely be used together under an analogous modulus.2.The malicious program equipment is nylon material, the skin of some burr wool is normal, please be careful to beat.Package :Packing : Plastic bag / Carton box.Quantity : According on your Choose!