Brooks B-135 Saddle HANDMADE IN ENGLAND - Manufactured by skilled craftsmen using 100 year old traditional techniques and the finest vegetable tanned leather on the planet. VEGETABLE TANNED LEATHER- The B135 has a leather top made from the finest 3.5mm vegetable tanned leather. DOUBLE COIL/LOOP SPRINGS- Features double rear coil springs and double loop front springs. BROTHER OF B66- The classic B66 lent its seat shape for the creation of the B135. STEEL RIVETS- The rivets are made of 100% tubular steel and accompanying aluminum work.