The Tangent Vortex Carbon Bars-4.5in at J&R Bicycles are manufactured with high quality carbon fiber in order to provide BMX riders superior performance. These junior handlebars have a 4.5 inch rise and even though they can take quite a beating, they only weigh about 10 ounces. The No-Slip clamping area means once secure, these bars won’t slide on you. Maximum recommended weight limit is 100lbs and it is strongly suggested you use carbon gripper paste when assembling carbon components.