ITEM NAME:6200Z 10mm x 30mm x 9mm Double Shielded Ball Bearing B1U7 6200Z 10mm x 30mm x 9mm Double Shielded Ball Bearing B1U7 A9B8 C5W2 Shield ball bearing as replacement part for bike, scooter and industry machine. Shield design sealed ball bearing. With less coefficient of friction, less vibration and noise. Product Name : Ball Bearing Model : 6200Z Material : Chrome Steel Color : Silver Tone Inner Diameter : 10mm / 25/64" Outer Diameter : 30mm / 1 2/11" Width : 9mm / 5/14" Package Content : 1 x Ball Bearing Note:Light shooting and different displays may cause the color of the item in the picture a little different from the real thing.The measurement allowed error is +/-1-3 cm.