2 PCS 6804-2RS (20x32x7 mm) Bicycle Ceramic Si3N4 Rubber Sealed Bearing Bearings
2PCS 6804 SC6804 2RS Si3N4 Bicycle Ceramic Ball Bearing Rubber Sealed HOPE PRO2. Balls: Si3N4 Silicon Nitride ceramic balls. 2pcs si3n4 ceramic hybrid ball bearing. Bearing size: 20mm(ID) x 32mm(OD) x 7mm(W).