Sufficient content: this package contains adequate quantity of extruder wheels in a pack, sufficient quantity to satisfy your various demands and replacements Check the dimension: each 40 teeth gear measures approx. 11 x 11 mm/ 0.43 x 0.43 inch in length and width, its inner diameter is approx. 5 mm/ 0.2 inch, 40 teeth, fit for most standard 3D printers; Please check whether the size is suitable for your needs before purchasing Practical function: our 3D printer parts can replace your broken one and make your printer work more efficiently, improve the performance and reliability for your 3D printers Good bearing capacity: these drive 40 teeth gears are made of quality brass, rustproof and no corrosion, durable and stable to use, with good bearing capacity, allow for improving your printers' work efficiency Wide compatibility: our brass extruder wheel gears are easy to install, compatible with CR-10, CR-10S, S4, S5, Ender 3, Ender 3 Pro and most 3D printers Extruder wheel 3D printer parts drive 40 teeth gear brass extruder wheel gear compatible with CR-10, CR-10S, S4, S5, Ender 3, Ender 3 Pro Feature: Good compatibility: Our extruder wheels are compatible with CR-10, CR-10S, S4, S5, Ender 3, Ender 3 Pro and most standard 3D printers, sturdy and durable for your long-term using. Nice performance: Our 3D printer parts can replace your broken one and make your printer work more efficiently, improve the performance and reliability for your 3D printers. Specification: Material: brass Size: approx. 11 x 11 mm/ 0.43 x 0.43 inch in length and width Color: yellow Note: This is not an original product, the mention of these brands and any related model above is only for purposes of expressing compatibility, not for trademark, our trademark is Mudder. Small and inedible items, choking hazard may exist, please keep away from children under 3 years old. Manual measurement, please allow slight errors on size. The colors may exist slight difference due to different screens.