Prologo SADDLE SCRATCH 2 TIROX 143 BK Best suited for road riding applications Ti-Rox rail construction: an alloy steel, highly resistant to traction, and torsion. Rail profile shape is circular, with a 7mm diameter General Prologo sizing: 134mm width size is available in Prologo's Round, Semi-Round, and Flat saddle shape offerings. 141, 143, and 147mm widths are also offered in select Prologo saddle s Light padding with Prologo's Active Density Technology, carbon fiber injuected base, microfiber cover Material: Synthetic