YOU ARE BUYING 12 - 3 oz of VersaChem Mega Black O.E.M Import Gasket Maker Sensor Safe Silicone Gasket Maker Mega Grey PART #99839 Made in U.S.A. Versachem Mega Black Silicone is a high performance, moisture curing gasketing material that cures into a strong, silicone rubber to make formed-in-place gaskets. Maintains long term durability and flexibility, and will not harden, shrink or crack. Forms a tough, flexible silicone rubber gasket that resists aging and weathering. Works best on silicone, cork, felt and rubber gaskets. This black, waterproof, low odor formula is non-corrosive to steel, iron and aluminum, oxygen sensor safe, low volatile, non-toxic, non-flammable and OEM (Original Equipment Manufacturer) approved. Tensile strength of 240 PSI, and temperature range of -65F to 400F (continuous); -65F to 650F (intermittent) PLEASE GIVE US A FEEDBACK AND WE WILL DO THE SAME!!