Material: Blue Nylon (Plastic)Standard: GBModulus: 1 ModuleNumber of teeth: 15-30 TeethInner hole: 4mm, 5mm, 6mm, 6.35mm, 7mm, 8mm, 10mm, 12mm, 14mm, 15mmTooth Surface Hardness: Soft enamel surfaceFeatures: Light weight, excessive strength, self-lubrication, good flexibility and coffee noise.Pre-purchase Instructions:1. The total dimensions (likes, step diameter, whole thickness and so on) could be a little diversified in line with the batch;2. Nylon tools because of the material problem, particular person could have burrs, yet will not impression to use. If you mind, please be careful to purchase;3. The module represents the scale of the teeth, the bigger the module, the larger the tooth, the bigger the corresponding bearing capacity.4. Our shop additionally helps non-standard customization, welcome to inquire!You can find more merchandise in different material, type, colour , sizes and shapes in our shop! If you've particular needs, please touch us, we can customize in line with your needs!Package includes: 1 piece * According for your choiceNotes:1.The color of the image is slightly various from the genuine object because of the digicam and light effect, please take the actual object because the standard.2.There might be 0-0.3mm error for its thickness, 0-3mm error for its diameter / width / size within the manual measurement, please take it into consideration, thank you!