... : 626ZZ rollerBearing Size: 6*19*6mm Bearing material: carbon steelRoller material: nylonProduct Feature:1.Low coefficient of product,reduce ... of advanced technology production Material Option:1.Bearing Material:carbon steel,chrome,stainless steel,iron,copper,ect.2.Roller ... natural color, green, orange, blue, grey, milky white, porcelain white etcProduct Series:60,62,69,68,6000series, and non-standard ...