These carbon fiber c-channels can be used for a multitude of applications. Whether you need to stiffen up your structure, close out an edge or use as a mounting extension we've got you covered. As result of the manufacturing method used to make these parts the legs have a slight bow in. This can easily be overcome with the lightest of pressure and allows for a very small clamping force if using these parts as edge closeouts / protectors. The outer surface is cello wrapped gloss and the inside surface is smooth semi-gloss. If you plan to use these in applications requiring bonding be sure you prepare the surfaces thoroughly. These parts are not provided bond ready.