Ritchey Comp Biomax Saddle with Steel Rails: Ritchey Comp Biomax Saddle has Wing design to dissipate vibration & is 35% carbon injected shell for stiffness & light weight. Wing design to dissipate vibration Extra padding over Streem 35% carbon injected shell for stiffness & light weight Steel rails Vinyl surface 325g Available in black or white Pro & WCS versions also available