RockShox Reverb Stealth (B1) Dropper Seatpost Material: [shaft] 3D forged 7050 aluminum, [head] forged 7050 aluminum Diameter: 30.9 mm, 31.6 mm, 34.9 mm Length: 340 mm, 390 mm, 440 mm, 480 mm Offset: 0 mm Travel: 100 mm, 125 mm, 150 mm, 170 mm