Compatibility: Specifically designed for Kobra3 and Kobra2 series, ensuring a and seamless operation. Durability: Crafted from high-quality materials, this extruder pulley is built to last, reducing the need for frequent replacements. Enhanced Performance: Improves your 3D printer's functionality by enhancing printing precision and speed. Easy Installation: Simple to install, this pulley allows for a quick upgrade, you back to printing in no time. Essential Upgrade: Upgrade your 3D printer accessories for a faster and smoother experience.Our pulley set,ensures perfect compatibility and optimal performance. Color: Silver & Black Material: Metal+Plastic Package Contents: 4 * Pulley 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.