Our nature rubber and aluminum stem with zinc core, air leak test with 8MPand pulling test at more than 700N,Tubeless rubber snap-in valves allow a maximum pressure of 65 psi and are designed for passenger car, light-duty trailer and light truck applications, as well as are suitable for use in autocross competition. These rubber snap-in valves are available to fit 0.453" diameter holes in the rim and the effective lengths are 1.5