Counter Act Tire Balancing Beads - Service PackKit Includes 20 pre measured bags 20 caps 20 cores Features: No more external weights Made from micro glass beads Increases tire life, improves fuel economy Reduced vibration and heat build up Tires are balanced all the time not just at over 30 mph like other balancing products No re balancing every time you come to a stop No dust to clog valve cores Guaranteed safe for all tire pressure monitoring systems (TPMS) Can be used in tube type and tubeless