Pro Glider 444 Fastpitch Softball Training Bat Includes 3 Extra Balls. PROGLIDER Pro Glider Bats are designed to promote a correct softball hitting swing. Spice up your softball hitting practice with a training bat designed to specifically to promote proper softball hitting mechanics Proglider bats promote: Keeping your hands inside the ball. Improved bat speed. Increased hitting power. A good follow through This product will teach the hitter about his/her release point and contact point with an emphasis on the hands taking an inside approach to the ball. Plus they help give you the elevation you need to hit more line drives The 444 models have a handle, a shaft, a glider (that the ball rides on) and a stop. When you swing. the glider slides up the shaft, hits the stop (clicking sound) and the ball takes flight The 444 models are minus -9 to the length. Example: If the bat is 32" long it will weigh 23 oz.