New updated design! 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 and are available in assorted lengths. Specifications:- Length: Small 75mm, Medium 180mm, Large 330mm- Diameter: 25.4mm- Material: 3D Forged 6061-T6 Aluminum- System: Stealth- Weight: Small 2.0oz, Medium 4.1oz, Large 6.8oz