All our rollers and sheaves have bronze bushings like our competitors, but BENLEE has grease grooves in our bushings. This means they hold more grease, meaning they last longer. Also, all others use 8″ or 10″ pulleys/sheaves. BENLEE has 12″ sheaves. This significantly larger diameter helps the speed of your system. It also means our sheaves and pulleys will have longer life, so higher uptime and lower cost to own and operate.