S6206 Open Ball Bearing Premium ABEC-5 Quality with Si3N4 Ceramic Balls (Silicon Nitride) 30mm x 62mm x 16mm S6206 open stainless steel ball bearing, radial and deep groove ball bearing,S6206 bearing is made of Stainless Steel with Ceramic Balls (Si3N4) and Nylon Cage,the quality is set to EMQ (Premium ABEC-5 quality) to ensure high speed,inner diameter is 30mm, outer diameter is 62mm and width is 16mm.