A curveball spinning on a vertical axis completely perpendicular to its flight path and thus with complete side spin that is either 3–9 for a right handed pitcher or 9–3 for a left handed pitcher is called a sweeping curveball, flat curveball, or frisbee curveball. The flat curveball will still drop because of gravity, but due to the lack of top spin the drop is only a small amount compared to the 12–6, 1–7/11–5, or 2–8/10–4 curveballs. Most often this side spin happens due to a pitcher having an arm angle that is either side arm or at a very low 3/4 arm angle. However, sometimes complete side spin happens for a pitcher who has a higher arm slot due to the person throwing the pitch with a twisting motion causing the fingers to move around the side of the ball instead of over the top of the ball. Using this twisting motion around the ball is said to cause injury to the arm near the elbow. A slider's spin axis is almost parallel to the ball's flight path similar to a football or bullet, but tilted slightly upwards pointing to 12 o'clock. When a slider's spin axis points to 1 o'clock or 2 o'clock, then the pitch becomes a slurve. This slurve tends to happen when a pitcher uses too much force on the curveball and less finesse. This happens because the pitcher may lazily pronate slightly at the release point instead of following through with complete supination at the end of the throw for the curve. At other times the slurve will happen due to the pitcher supinating a little too much at the release point when throwing a slider, which may be called a slurvy slider. A slurvy slider with the same velocity of a power slider (5-8mph slower than a fastball) may impart a greater break.