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 Length 277 Material Rubberized Rail Material Carbon Saddle Cut Out Yes Width 132 Brooks Cambium C13 Saddle Saddles UPC: 190445015377