The Box One Saddle is about the smallest and lightest seat-seatpost combo out there. Its nylon seat is co-molded to the carbon fiber seatpost to form a bond so strong it’s virtually a single piece. These seats are designed specifically for BMX racing. FEATURES Carbon Fiber Post Co-molded Nylon Shell Impact-Resistant Clear Coat Finish Minimum Insert Indicator SPECIFICATIONS Box One Saddle Specification Chart SIZE SADDLE MATERIAL SADDLE DIMENSIONS SEATPOST MATERIAL SEATPOST DIAMETER (Ø) SEATPOST LENGTH WEIGHT SIZE: Small SADDLE MATERIAL: Co-molded Nylon Shell SADDLE DIMENSIONS: 165mm x 108mm SEATPOST MATERIAL: Carbon Fiber SEATPOST DIAMETER (Ø): 22.2mm SEATPOST LENGTH: 135mm WEIGHT: 132 grams SIZE: Large SADDLE MATERIAL: Co-molded Nylon Shell SADDLE DIMENSIONS: 216mm x 114mm SEATPOST MATERIAL: Carbon Fiber SEATPOST DIAMETER (Ø): 27.2mm SEATPOST LENGTH: 135mm WEIGHT: 161 grams