Tie bar covers also protect the machine from the moldings That's right. In-mould labeling is a hazard for tie bar bushings. Let a loose label get between the bushing and the tie bar and see how fast your bushings wear out. IPS offers covers made of tough, oil resistant polyester material with plastic zippers. They are attached to the movable platen using magnetic restraints and are attached to the tie bar at the stationary platen using a Velcro strap. Tie bar covers are offered in the following sizes: Tie bar cover length = platen maximum opening and must be specified when ordering. A complete set of tie bar covers contains 4 covers complete with all mounting hardware.