The belayer wears a harness to which they have attached a belay device. A bouldering competition consists of climbing on short walls without belay ropes. Most climbing gyms lend harnesses, ropes and belay devices. A belay anchor is attached to a cliff in supporting a belay or toprope. Silent belay communication is possible via tugging the rope. The rope threads through the belay device. Note that some belay devices are better suited for different rope diameters. Once anchored, the leader will then belay the climber coming up from below. All pitches have belay anchors at the top. In one position, the rope runs freely through the belay device. Free climbing has since been divided into several sub-styles of climbing dependent on belay configuration. Each section of a climb between stops at belay stations is called a pitch. This type of belay, however, causes the rope to become twisted. This device is not suitable for left-handed belay technique. This then becomes the next belay station.