1 and high-quality. 2It can withstand the pressure of high speed operation. 3The deep-groove rollaway nest is more steady while operating. 4The material is bearing steel which is especially for bearings. 5The double-shielded ball bearings provides a better running environment for bearing balls. Features: and high-quality. It can withstand the pressure of high speed operation. The deep-groove rollaway nest is more steady while operating. The material is bearing steel which is especially for bearings. The double-shielded ball bearings provides a better running environment for bearing balls. Specification: Material:Bearing Steel Holder Material:Steel Plate Scroll Column:1 Rollaway Type:Deep-groove Rolling Element:Ball Angel:15 Seal Cover:Double Shielded Product Usage:General Model (Optional) Size Weight 6800-ZZ 10*19*5mm/0.39*0.75*0.2 in 50g/1.76oz 6806-ZZ 30*42*7mm/1.18*1.65*0.28in 250g/8.82oz 6807-ZZ 35*47*7mm/1.38*1.85*0.28in 280g/9.88oz 6808-ZZ 40*52*7mm/1.57*2.05*0.28in 320g/11.29oz 6809-ZZ 45*58*7mm/1.77*2.28*0.28in 410g/14.46oz Package List: 10*Deep Groove Ball Bearing Note: As different computers display colors differently, the color of the actual item may vary slightly from the above images.