A climbing wall is an artificially constructed wall with grips for hands and feet, usually used for indoor climbing, but sometimes located outdoors. Some are brick or wooden constructions, but on most modern walls, the material most often used is a thick multiplex (plywood) board with holes drilled into it. Recently, manufactured steel and aluminium have also been used. The wall may have places to attach belay ropes, but may also be used to practice lead climbing or bouldering. It is called Sports Climbing. Now it is an Olympic sports event.