Improve your road cycling performance with the Hi-Tech Carbon rails of the 3D printed SLR Boost 3D Kit Carbonio Superflow.Technical Specifications:WeightS3 166 g ( 8%) - L3 171 g ( 8%)DimensionsS3 130 x 248 mm L3 145 x 248 mmRailCarbon 10mm 7x9 mmIntended useRoadFamilySLR