. No more problems with getting the wrong seatpost or needing another one when you change the type of saddle you use ? it now takes 30 seconds to transform your seatpost. And the best news is that despite the double functionality, the Zero25 is even lighter than our previous seatpost Features: Shaft Material: Al-Alloy 7075Head Material: Al-AlloyFinish: Shot Peened Black AnodizedSet back: 0/25 mmBolts: Stainless steel zinc. blackWeight: 223 g (27.2 mm x 350 mm)Length: 350 mmDiameter: 27.2 mm/ 31.6 mmBuy 3T Seat Postsÿfrom Chain Reaction Cycles, the World?s Largest Online Bike Store.