uxcell LM4UU Linear Ball Bearings 4mm Bore 8mm OD 12mm Length for CNC Machine 3D Printer 2pcs

1.Made of  Bearing Steel material, Double Side Rubber Seal Linear Motion Ball Bearing Bushing. 2.Great for linear motion on 3D printer, cnc, and other applications. 3.These ball bearing are fitted with two rubber dust sealed to prevent ingress of dirt, water and foreign matter. 4.Bearings may require lubrication and break in period. 5.Smooth moving, low friction, high rigidity and long life. Economical, easy to maintain replace. Specifications Product Name: Linear Bearing Package Content: 2pcs x Linear Bearing Material: Bearing Steel, Rubber Color: Silver Tone Weight: 7g Model: LM4UU Outside Diameter: 8mm  Inside Diameter: 4mm Length: 12mm