The zero ii nack is a flat saddle for short to medium distance riding where a frequent change in position is necessary the new ti rox rails are made from alloy steel this material is highly resistant to traction and torsion with a great balance between lightweight and high strength key features roadxcmountain tirox rails stainless steel for a lower weight than the old ti 14 rails greater resistance and vibration absorbtion flat design light foam padding weight 165g