This bicycle has a full aluminum body. The entire body is aluminum except for the handlebar and suspension. It has a 7-speed freewheel at the back and a 3-speed cassette at the front. The rear brake is brand new and the front brake is a bit old. The front suspension does not have a lock-out system (UC brand suspension). Both the rear and front gear shifters are in perfect working order. The rear gear shifting is just slightly slow and can be a bit inconsistent. The bicycle hub is made of full aluminum and is very smooth.