Name: 1Mod Plastic Nylon Positive GearColor: BlueNumber of teeth: 15T, 16T, 18T, 20TProcess hole: 5/6/8/10/12mmMaterial: NylonTooth thickness: 10mm12 to 60 teeth are light blue, while 65 to 100 teeth are dark blue.Modulus is a model that represents the size of teeth. The larger the modulus, the larger the teeth, and the greater the applied force.The inner holes of the gears are all small holes manufactured by the factory and need to be reworked later before they can be used.Due to various factors such as onitor brightness and lighting intensity, the actual color of the item may differ slightly from the image displayed on the website.Please consider the slight manual measurement deviation in the data1-2mm.Your satisfaction is our greatest pursuitHope you have a pleasant shopping experience Nylon material ensures durability and longevity for various mechanical applications. Includes 8 pieces of spur gears with tooth counts ranging from 15T to 20T, perfect for different speed and torque requirements. Compatible with Mod 1 motors, making it an ideal choice for hobbyists and professionals in robotics and DIY projects. Bore sizes of 5mm, 6mm, 8mm, 10mm, and 12mm provide versatility for various shaft sizes. Easy to install and use, these gears are perfect for enhancing your mechanical designs and projects. Model HOKEYHOFAV Brand Name HOKEYHOFAV Part Number HOKEYHOFAV Manufacturer HOKEYHOFAV