Naturefly Carbon Bamboo Mountain Bike Frameset 27.5 Including: Frame+Carbon Seatpost+Seat Clamp+Headset Bamboo design is an innovation, leading you back to nature to smell flowers and grass. It is more protective to health and more environmental. Also economical cost to family. Bamboo frame is 100% handcrafted at a unique and exclusive bamboo tube to join together, not using any forms and molds. Frames are tested under EN standard. It is strong as steel, light as aluminum, stiff like carbon yet more reliable and naturally dampening vibrations. Bamboo is more tear and shock-resistant than steel. It is popularly used on streets, paved trails and off road, And can be mounted into multi-speed bike for 27.5 size. NF would always give all riders good beauty and quality as promised. Bamboo tubing performance and Non-chemicals hemp fiber joints Double-External routing for brake and derailleur cables Semi-integrated headset, and NF carbon 31.6 seat post. Model: FBM-107 Frame weight: 3100 grams Seat Post: NF Carbon 31.6 BB Type: BSA Eng 68 Headset: 1-1/8” to 1-1/2" Sizes: 16”(S)/18”(M) /20”(L)