Midwest Handpiece Dental Bearing Stainless Steel ABEC-7 Solid SI3N4 Ceramic Balls One Flanged Ball Bearing High quality ABEC-7 Flanged Bearing that fits Midwest Dental handpiece.This bearing isclosed from one side, bearing is Stainless Steel with 7 solid SI3N4 Ceramic Balls,, Bearing is made of Stainless Steel and has Solid Ceramic balls (SI3N4). Cage is made of Torlon for lowest fricion,long life and highest speed.