SDG Tellis Dropper Seatpost - 34.9mm, 125mm, BlackThe Tellis is one of the most durable and simplistic droppers on the market, with an easy cable actuated, sealed hydraulic cartridge system, featuring the softest lever action in the game and backed with a 2 year warranty and global support services, all at an affordable price point that doesn't break the bank. Internal routed, infinitely adjustable design Simplistic, fully sealed alloy cage stainless tip cartridge system Intelligent keyway system