Funn rsx stemdh bikes have gotten stronger and lighter as they have evolved and funns rsx stem has kept up with the evolution by continual updating in order to remain light yet strong the rsx is adjustable from 45mm to 50mm and is made from 6061 aluminium which has been fully cnc machined this direct mount stem is also lightweight weighing between 137g and 160g depending on the bar clamp diameter featuresmaterial al6061 full cncextension adjustable from 45mm to 50mmweight between 137g a