Oars are commonly built from the same materials as paddles. A canoe is usually fitted with long paddles and a sail made of canvas. Drivers can manually select gears using either paddles or an electronic gear selector lever. Regenerative braking is controlled by steering wheel-mounted paddles. The interior featured steering column mounted shift paddles. Instead, the kayaker uses plastic hand paddles. They built boats of tule to navigate on the bays propelled by double-bladed paddles. World Championship of Ping Pong uses old-fashioned wooden paddles covered with sandpaper. The regatta starts with the teams using paddles, then sails. LSOs used coloured flags, cloth paddles and lighted wands. Their common subjects include stick-like human figures, dogs, boats, sails, paddles, footprints, and ceremonial headdresses. McCallum made the first paddles that were specifically for paddleball on his basement bandsaw. Its locomotion was to be provided by forty rowers with giant paddles. When swimming, it paddles with both its front and back limbs simultaneously. The game is controlled via a joystick, paddles, or the keyboard.