GUB MTB Carbon Flat Hanldebar, Stem, and Seatpost Bundle 31.6 GUB Flat Handlebar SL 31.8mm x 610mm (120g) Reinforced internally to accept bar ends. GUB STEM 31.8mm x 90mm (154g) Carbon Alloy integration for maximum strength and shock absorption GUB SEATPOST 31.6mm x 350mm (218g)