All of our international power bars incorporate heat-tempered, high-stress alloy steel to protect against bending. Dual bronze bushings in the sleeves, with spring steel pin anchors inside them, ensure balance and smooth rotation on all black oxide bars. Our Harden-Chrome bars feature bearings in the sleaves for even smoother rotation. Maintenance is easy thanks to accessible lubrication points. Plus, durable rubber end caps protect floors and prevent scratching of freestanding equipment.