Stem combines high strength with ultra-low weight; the use of two independent, C-shaped handlebar clamps allows the stem body material to be reduced to a minimum, whilst maintaining an incredibly stiff and strong structure CNC machined 6082 aluminum body 7075 aluminum clamps Unique 240? C-shape clamps Minimal 6-bolt design U-shape cradle clamp eliminates handlebar stress raisers found with traditional stems Ultra-wide 64mm clamp width. RENTHAL INTEGRA 35 45X0MM