General description Double side seal linear motion ball bearing bushing, ideal for linear motion applications such as 3D printers and CNC machines. These ball bearings feature two rubber dust seals that effectively prevent the entry of dirt and foreign matter, ensuring smooth operation and longevity. Technical specifications Material: Bearing steel, rubber Color: Silver Weight: 788g Model: LM25UU Outer Diameter: 40mm Inner Diameter: 25mm Length: 59mm Measurement allowed error: +/- 1-3 cm Usage Perfect for linear motion on 3D printers, CNC machines, and other applications. Bearings may require lubrication and a break-in period for optimal performance. Designed for smooth movement, low friction, high rigidity, and long life. Economical and easy to maintain and replace.