S6207 Open Ball Bearing Premium ABEC-5 Quality with Si3N4 Ceramic Balls (Silicon Nitride) 35mm x 72mm x 17mm S6207 open stainless steel ball bearing, radial and deep groove ball bearing,S6207 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 35mm, outer diameter is 72mm and width is 17mm.