Tubes come pre-loaded with Counteract Balancing Beads, which eliminates the need for external wheel weights. Simply install the pre-balanced tube and ride. Tires are balanced all the time, not just over 30 mph like other products. Beads made from tempered glass. Increases tire life and fuel economy. Reduces vibration and heat build up. No dust to clog valve cores. 5.00/5.10-18