Prologo Scratch II CPC PAS Saddle, 134mm, Ti-Rox alloy rails: Hard Black Light padding, carbon fiber injected base, microfiber + CPC 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 CPC is Prologo's patented "Connect Power Control" technology; Small, hollow, rubber cylinders are strategically clustered at contact points to provide comfortable and secure contact between Ti-Rox alloy steel rails, highly resistant to traction, and torsion with circular profile measuring 7mm PAS Technology (Perineal Area System) helps to eliminate pressure spikes and numbness in the perineum