Our Boardtrack Seat top is made with the highest grade vegetable tanned Herman Oak leather money can buy. This biker seat could last a lifetime if it is taken care of. The pan is double layered with a 1/8" cold rolled steel plate. It is covered on the top and bottom with leather. It measures 10" wide by 14.5" long. The bolts are 7" apart. The leather is sealed with a beeswax base waterproofer, "Aussie leather conditioner".