What Has Two Thumbs and Rallies? This guy! The Aeffect R 1X Seatpost Lever delivers big time hassle-free height control. Designed to eliminate any excess bells and whistles that might fail, this lever gets the job done so you can focus on everything else. Skip The Slip Textured no-slip thumb pad helps your butter thumbs hit the lever right every time. Feels So Good No one has ever gotten carpal tunnel from a dropper lever and we aim to keep it that way. Ergonomically designed for 1X set-ups under your bar.