Bamboo+Alloy Mountain Bike Frame 27.5er Including Frame+carbon seatpost+seat clamp 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 and aluminum jointed frame is tested as 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 29er size. NF would always give all riders good beauty and quality as promised. Bamboo tubing performance and aluminum joints Double-External routing for brake and derailleur cables Semi-integrated headset and NF carbon 31.6 seat post. Model: FBM-106 Frame weight: 1950 grams/16” Seat Post: NF Carbon 31.6 BB Type: BSA Eng 68 Headset: Top 44 Down 44 Sizes: S / M / L