Comprehensive Kit: This kit contains 15 high-quality brass extruder gears, each with 40 teeth. Designed to improve the performance of your 3D printer, these gears are essential for smooth and efficient operation. Durable Material: These 40-tooth pulley drive gears are made from high-quality brass to resist corrosion and rust, ensuring long-lasting durability. Their rugged design supports high load-bearing capacity, optimizing the functionality of your 3D printer. Precise Dimensions: Each gear measures approximately 11 x 11 mm with an inner diameter of 5 mm, making it a perfect fit for most standard 3D printers. The precise dimensions ensure seamless compatibility and increased printing accuracy. Universal Compatibility: These gears are easy to install and compatible with a wide range of 3D printers, including the for CR-10, CR-10S, S4, S5, Ender 3, and Ender 3 Pro. This versatility makes them a valuable addition to any 3D printing setup. Colour:Yellow Material:Brass Package Contents: 15 * 40 teeth feed gear Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.