MRC 111KS Radial Conrad-Type Ball Bearing, Extra Light, Single Row, ABEC 1, Open, 55 mm Bore, 90 mm Outside Diameter, 18 mm Width, 9000 Maximum RPM: Deep Groove Ball Bearings: Amazon.com: Industrial & Scientific
Iron Sealed Ball Bearings, Deep Bearing Easy to Install Radial and Axial Load for Linear Motion Equipment 625 Iron Sheet Seal: Amazon.com: Industrial & Scientific
Deep Ball Bearings, Radial and Axial Load Rubber Sealed Bearing Moderate Speed 10PCS Easy to Replace for Linear Motion Equipment 6301 Rubber Seal: Amazon.com: Industrial & Scientific
Amazon.com: Iron Sealed Ball Bearings, Radial and Axial Load 20PCS Miniature Deep Groove Bearing Lightweight with Reasonable Speed for Linear Motion Equipment(627 Iron Sheet Seal) : Industrial & Scientific