Features and Benefits:Kit contains 4 x 14oz Bags of Counteract, 4 x Counteract Vortex Valve Cores, 4 x Counteract Valve Caps, 1 x Counteract Valve Core Remover, 1 x Airless Injector Bottle and TubeTPMS Friendly, Extend Tire Life, Decrease Vibration, Balanced for the life of the tire, No Wheel Weights, Eco-Friendly.Counteract does not void any tire warranties and does not break down inside the tire. Trust the experts, we have been manufacturing the same product for 20 years. Do not be fooled by inferior copy products. If your vehicle has TPMS we do not reccomened installing the product via the valve stem, you must install the product while the tire is broken down or on a new tire installation.