J&L Ultra light Ti/Titanium bolt Seatpost clamp 31.8/34.9-9g Made of 7075 Anodized Aluminum Alloy CNC Machined and Polished surface Ti bolt included, 2 Sizes available: 31.8mm(9g) for 27.2 or 26.8 seatpost 34.9mm(10g) for 30.9 or 31.6 seatpost