We wanted to stock these since we first saw them. The bodies are made from reinforced plastic, but they look like gum rubber. The levers are aluminum and the cables run under the bar, so there is no need to drill. They fit bars with internal bar end diameters of 19.6 to 20.6mm. They do not fit aluminum bars meant for MTB levers. Compatible with caliper or cantilever brakes, but not V-brakes. Sold as pair.