Counteract or any other internal tire balancing product is NOT recommended for us in small passenger cars (Such as a Honda Civic, Small Crossovers, SUV etc.). This product is only recommended in vehicles with a 1/2-ton suspension and up, Off-Road Vehicles, Motorcycles, ATV, UTV, Commercial Vehicles, Bus, RV and more. Counteract Balancing Beads is the only tire and complete wheel assembly balancing product on the market proven to improve fuel economy in two separate S.A.E and TMC type II tests. Counteract Balancing Beads are manufactured as a tempered glass bead that is placed inside a tire, or injected through the valve stem, allowing for a complete tire & wheel assembly balance without the use of external wheel weights. Counteract extends tire life, improves fuel economy, balances the complete wheel assembly, decreases vibration and driver fatigue, last for the life of the tire, and is environmentally friendly. The DIY Kits include everything you need to install the product at home via the Valve Stem. If you are having new tires mounted, every bag of Counteract 4oz & up is a Drop In Bag system. Simply open your Counteract Balancing Beads bag, and place the inner clear bag containing Counteract inside the tire cavity as it is being mounted. Once the tire is sealed and mounted to the vehicle, the bag will break on its own when the vehicle starts to move.