Sufficient content: this package contains 10 pieces of extruder wheels, sufficient quantity to satisfy your demands and replacements. Check the dimension: each 36-tooth gear measures approx. 11 x 11 mm/ 0.43 x 0.43 inch (L x W), its inner diameter is approx. 5 mm/ 0.2 inch, 36 teeth, fits most standard 3D printers; Please check if the size is suitable before purchasing. Practical function: our 3D printer parts can replace your broken one and make your printer work more efficiently, improving the performance and reliability of your 3D printers. Good bearing capacity: these driving 36-tooth gears are made of quality stainless steel, rustproof and no corrosion, durable and stable to use, with good bearing capacity, which makes it possible to improve your printers' working efficiency. Wide compatibility: our stainless steel extruder wheel gears are easy to install, compatible with for -10, -10S, S4, S5, 3, 3 Pro and most 3D printers. Colour: silver. Material: Stainless steel. Package Contents: 10 * Extruder Wheel Gear. Only the above package content, other products are not included. Note: Light shooting 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.