Ten-pin bowling ramp in which a bowler will use two hands and push the ball down the ramp onto the lane. There are three widely recognized delivery styles used while the ball is released onto the lane. (See article: Bowling form.) These are the "stroker", "cranker" and "tweener" styles. Lesser used (and newer) styles include "no-thumb" and "two-handed". Strokers often keep their shoulders square to the foul line and their backswing generally does not go much above parallel to the ground. This type of delivery reduces the ball's rate of revolution, thus decreasing its hook potential and hitting power. Strokers rely on
Ten-pin bowling a "shovel-pitch" from the side. A conventional bowling ball is designed to roll about a generally horizontal axis, and often the core is asymmetric so that the ball can hook naturally. However, in parts of Asia, the "spinner", "helicopter" or "UFO" release is more common. A ball spinning about a generally vertical axis of rotation spins like a top down the lane, and slides straighter, regardless of oil pattern. The ball takes an unconventional path along the front pins ("deflection"), creating domino effect pin action. The spin is generated by rotating the hand counter clockwise (right-handed bowlers) until the hand