Features and Benefits:Kit contains 4 x 4oz Bags of Counteract, 4 x Counteract Vortex Valve Cores, 4 x Counteract Valve Caps (Valve Cores and Caps are packed in each bag)TPMS Friendly, Extend Tire Life, Decrease Vibration, Balanced for the life of the tire, No Wheel Weights, Eco-FriendlyCounteract 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 more than 22 years. Do not be fooled by inferior copy products.