Crupi's newest seat model that works with any Pivotal Seat Post. Pivotal seats are much lighter in weight than traditional seats and posts. Their Pro Pivotal seats weight just 255 grams! There are many angle adjustments and a much, much easier installation compared to the railed seats! No more fussing with mounting the seat rails on the post, simply set the seat on top of the pivotal post, adjust to desired angle and tighten the screw through the flap on top of the seat.