Features: _x000D_ These solid polymer LM8UU bearings can eliminate vibration and unnecessary noise. _x000D_ If you add the lubricating oil, the smooth degree will be better. _x000D_ This sold polymer Linear bearing is a direct replacement for the metal LM8UU bearing. _x000D_ Commonly used in many 3D Printers, etc small making use(Large machines are not recommended). _x000D_ These solid polymer LM8UU bearings are great for RepRap, for Prusa, for Mendel, etc. _x000D_ _x000D_ _x000D_ Specifications: _x000D_ Model: LM8UU _x000D_ External diameter: 16mm/0.63inch _x000D_ Inner diameter: 0.8cm/0.31inch_x000D_ Length: 25mm/0.98inch_x000D_ Purpose: 3D printer _x000D_ Weight: 35g _x000D_ Oil lubrication method: drip lubrication(lubrication not included) _x000D_ _x000D_ _x000D_ Package Included: _x000D_ 8 x Solid Polymer LM8UU Bearing 1These solid polymer LM8UU bearings can eliminate vibration and unnecessary noise 2If you add the lubricating oil, the smooth degree will be better 3This sold polymer Linear bearing is a direct replacement for the metal LM8UU bearing 4Commonly used in many 3D Printers, etc small making use(Large machines are not recommended) 5These solid polymer LM8UU bearings are great for RepRap, for Prusa, for Mendel, etc