a rubber plastic composite cylinder that has a cylindrical hollow elastomeric body bonded internally to a shaft and its external surface bonded to a cylindrical sleeve of ultra high molecular weight polyethylene which includes the bonding as by vulcanization two outer shells of ultra - high molecular weight polyethylene to the elastomeric cylinder to place the elastomeric cylinder in compression . such composite cylinder may be spaced along a shaft or utilized effectively as a coaxial shear spring or as conveyor rollers .