Wide compatibility: Applicable to most consumables on the market, such as PLA/ABS/PETG/PA-/PLA-/PET/ASA/- etc. Upgraded Material: Made of high carbon hardened steel forging base, hardness reaches HRC 60+,Compressive strength increased by 300%,no fear of high-load continuous printing tasks. The is covered with nano-scale (diamond-like carbon) coating, The hardness is comparable to that of natural diamond, and the friction coefficient is reduced to 0.1, Realizing the "Zero Wear Life Revolution" Note: Installation guide not included, we strongly recommend you professional installation. Please check as much as possible to make sure the item is what you need. Tips: The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Color: Black Material: Steel Package Contents: 2 x Gear 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.