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? Pulley: It's used together with timing belt, very convenient to use. 20 Teeth contact with the belt, that minimizes the chance of the belt slipping. ? Tensioner Torsion Spring: With the springs, you can add the right tension you need and make your prints much more precise. ? Compatibility: compatible with most 3D Printers. Attention: Small parts, keep away from children! International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions.