Due to the inner surface of the spherical inlaid composite material, therefore the bearing can produce self-lubricating during work. Widely used in machinery such as hydraulic cylinder, forging machine, auto damper, wrapping machine, automation equipment etc. Great for you to replace the damaged ball bearings in your devices to improve them efficiency and save energy. Features - Color: Silver. - Material: Copper. - Size: 4.00 x 1.50 x 0.60cm/ 1.57 x 0.59 x 0.24 inch. - copper material allows them stand wear and tear, prevent deformation of the body. - design, craftsmanship and excellent , easy to install and use. - Large load capability, easy mounting and dismounting and mechanism simplification. - Copper race and hardened, plated steel ball for strength and resistance to wear and corrosion. - The product features smooth operation, small error, low noise, high speeds. Package list: 4 x rod ends bearings