Stan'S No Tubes Tire Race Sealant 32Oz (946Ml)* Close to twice the amount of sealing crystals plus special "XL" crystals capable of sealing even larger punctures. * Combination of large and small sealing crystals interlock to form a lattice work that not only seals but strengthens and reinforces the area of the puncture allowing for an entirely new level of sealing performance* Must be installed directly into the tire cannot be injected through the valve