KINK ERICSON STEALTH SEAT
The Ericsson seat features a classy four-panel design, with perforated vinyl top and sides and rugged rear panel. All black materials with black stitching are complimented only by a small woven tag at the rear of the seat. This seat also features extra thick foam padding and Stealth system for easy installation with a 5mm allen key.
Made for a stealth pivotal post, can use a normal pivotal post but you will need a real long 5mm allen key.
If you want a cheap stealth seat post check here.