ENHANCED VEHICLE PERFORMANCE - ECO Balance XL glass balancing beads for trucks, motorcycles, and off-road vehicles provide an automatic, readjusting, trouble-free, lifetime balance of the entire wheel assembly EASY TO USE APPLICATION - The bag-in-bag balance bead application makes it easy to install. Place small bead bags side your tire when mounting new tires on to the wheels * (4) 8oz Balance Bead Bags, (4) Valve Caps INCREASED TIRE LIFE - ECO Balance XL EXTREME condition balancing beads reduce the rolling resistance with centrifugal force, reducing and providing a more even wear across your tires *ECO Balance does not void any tire or wheel warranties IMPROVE FUEL ECONOMY - Balancing beads help reduce resonating suspension synchronizing by balancing the wheel assembly with centrifugal force, decreasing fuel consumption over speeds of 55 mph, and increasing fuel savings ENVIROMENTALLY FRIENDLY - Made of reusable, recyclable 99.9% tempered glass bead spheres that are installed side the tire and wheel assembly, preventing any accidental contamination to the environment or damage to the side of your wheels