Carbon Seat Clamp,Monocoque Carbon Seat Clamp,Weight:18g,Sizes :ID 31.8mm/34.9mm, Carbon Seat Post ClampMonocoque Full Carbon Fiber Seat Post Clamp For BicycleFinish:Gloss/Matt,Weave:3K/UD/12KWeight:18g +-3gSizes:31.8mm/34.9mm 2 Years WarrantyPassed EN Test For sample purchase,please visit, http://www.aliexpress.com/store/600583 Carbon Seat Clamp,TR-CP002CF