Frame elements that carry the workpiece table or spindles. There are three main types of ways: box, roller and hydrostatic. A box way is the oldest and simplest. It has high stiffness, good damping characteristics, a large surface contact area, and resistance to high cutting and shock load. A roller way consists of a rail and a slide, but has a rolling-element bearing between the two. A roller way has a lighter weight and operates with less friction than a box way, so it can be positioned faster and with less energy. With a hydrostatic way, the slide moves on a pressurized film of oil. Friction is almost zero, minimizing stick-slip and wear.