one hundred pc Brand new and excessive qualityType: Ball bearingSize: 4*7*2.5mm Material: chrome steelPlace of Origin: China (Mainland)Our bearing high quality is normal, C0 common clearance, ABEC1 precision, the bearing can't be used on high-speed motors or same high-speed machine, if you'd like excessive pace bearing, please contact with us through email or trademanager.Package content: 40pcs MR74zz ball bearing