Leap frogging off the original Pivotal seat system, the Stealth system offers a way to install your seat without fishing an allen key through the top patch. With the Stealth system, the need for a patch and slot on the seat is eliminated and the anchoring seat bolt can be threaded from the bottom using a Stealth seat post. Kink Stealth seat posts are made from a single 3D forged piece of 6061-T6 aluminum. Note: You can also use traditional Pivotal seats with Stealth seat posts. ###section### Product Specs TYPE: Pivotal LENGTH: 330mm DIAMETER: 25.4mm WEIGHT: 126g / 4.5oz