about the truck and bus brake pads of us are all used the professional bus friction materials it can be use more than 50-70 kilometers , if use the EPMM friction materials the pads can be use nearly 100kilometers , and the materials of EPMM satisfied for the protect the environment requires for some developed country , so our new materials products had sale to the country of American and Euro, and get the good analysis by the professional buyers, so waiting for your kindly inquiry soon, we will reply your need A.S.A.P.