Features: brand new and high quality With precise hole location, easy to install. Made of high reliable quality and durable material. Advanced manufacturing technology, high reliability and high performance. Low upgrade cost, cost-effective(high cost performance, technical guidance, mature solution A must have upgrade kit for your Ender 3 printers, let your printer more durable. Adjust the belt and also suitable for Ender 3 Pro Cr10. Specifications: Model Type : Dual Z-axis Belt Stretch Color: Black Weight:700g Material: Metal Size:Pls See the Pictures for: Ender-3 / Cr10 (Optional) Package Size: approx 55.5x14x5cm/21.85x5.5x1.97in for CR10 approx 41x16x8cm/16.14x6.3x3.15in for Ender-3 Note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment. Package includes: 1 Set Dual Z Axis Belt Stretch