these are low friction bando brand belts. suitable for 25.5T, 21.5T, 17.5T and 13.5T. Not recommended for mod. They are low friction. the white adds a nice touch to the car too. do you need them, maybe not. Do they look cool, yes! Often, some people will sand down standard belts, these avoid that need. These belts will fit any touring car that uses 351mm sized belts.