GUB MTB Carbon Riser Hanldebar, Stem, and Seatpost Bundle 30.9 GUB RISER HANDLEBAR SL 31.8mm x 640mm (150g) Reinforced internally to accept bar ends. GUB STEM 31.8mm x 70mm (120g) Carbon Alloy integration for maximum strength and shock absorption GUB SEATPOST 30.9mm x 350mm (218g)