C13 utilizes the same vulcanized natural rubber and organic cotton top of the Cambium line, yet weighs less than the popular C15 model.Cambium- A new generation of saddles that offers a natural feel and flexibility unlike any foam or gel saddle on the market Item Specifications Clamp Style 7x9 Carbon Rails Color Black Defined Color Black Gender/Age Unisex Length 275 Material Rubberized Rail Material Carbon Saddle Cut Out No Weight 310 Width 158 Brooks Cambium C13 Saddle Saddles UPC: 190445016305