Made of GCR15 bearing, with high hardness of bearing material and high-precision CNC machine tool polishing. Built in high-strength rolling element, with good load-bearing capacity and more wear-resistant rollers. The bearing surface is smooth and flat, with model engraving and neat cleaning. AUC bearing models are complete, and users can choose specifications according to their needs. Heavy duty support roller needle bearing x 1/3/5/10pcs. Please list your special requests color, packages, etc. (15-35 Days to Delivered). Please contact me before you return it. Not accept returning of electronic components. Feedback is very important to us.