S6000 Open Ball Bearing ABEC-7 Quality with Si3N4 Ceramic Balls (Silicon Nitride) 10mm x 26mm x 8mm S6000 Open Stainless Steel, radial and deep groove ball bearing,bearing is made of Stainless Steel with Ceramic Balls (Si3N4) and Stainless steel cage,the quality is set to EMQ (ABEC-7 quality) to ensure high speed, inner diameter is 10mm, outer diameter is 26mm and width is 8mm.