The Smith linear ball bearing pulley system has 20 cross-member lockout points which help you bail out from motion safely. It is durable and strong so you will be more confident to use it. Many users love it because of its easy assembly and features.

They contain an outer ring, inner ring, and a cage that holds and spaces bearing balls, the bearing's spherical rolling elements. These bearing balls must be perfectly rounded and spaced to prevent friction and bearing failure. Ball bearings come in single- and double-row configurations depending on the type and direction of loads they carry.