SDG's I-Beam technology is rapidly becoming the "New Standard" in the bicycle industry. Comprised with a s Super Tough Nylon Fiber Composite Base, the I-Beam seat and post system is much lighter than traditional set ups, yet offers 2-3 times more adjustability than current standard. Quick set up thanks to single easy to access 6mm Allen Key bolt. SDG I Beam system is the lightest one we've heard about!