Prologo Zero II Pas Saddle Matt Black 2016 Light padding, carbon fiber injected base, microfiber cover 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 PAS Technology (Perineal Area System) helps to eliminate pressure spikes and numbness in the perineum Ti-Rox alloy steel rails, highly resistant to traction, and torsion with circular profile measuring 7mm Material: Synthetic