Your speed won't be limited when you mount a saddle perched on 3T's Ionic 0 Ltd seatpost. Designed with no setback for lighter weight and a more aggressive riding position, it's also easily adjustable for exact saddle placement. 3T used a blend of lightweight and durable carbon and aluminum for the construction of the Ionic. For the shaft, 3T used ultra stiff high modulus carbon, which blends low weight, stiffness and comfort. Although stiff, carbon also helps to dampen the vibration from rough roads. The high modulus carbon is 3T's top of the line carbon. Atop the post, 3T uses it sophisticated Difflock seat clamp. This is a single bolt clamp was built from alloy and it is compatible with saddles that have 7mm round rails. The splined design of the clamp makes setting saddle angle and setback simple and it requires only lightweight clamping to ensure that the saddle is secure. The 3T Ionic 0 Ltd post weighs 200grams 31. 6 x 280mm and comes in One color Black with a grey stripe. It is available in three lengths: 280mm, 350mm. 420mm. Each length comes in either a 27. 2mm or 31. 6mm diameter.