Heater Slider Balls Are Available In 3 Types\u00a0 Heater Slider balls are available in 3 models with these being the softest and most highly visible of all. They weigh 2\/3 less than a regulation 5 oz. game baseball though are the same size, which makes them great for beginners and indoor use in smaller areas. These orange lite-balls are from Trend Sports\u00ae, the engineers and manufacturers behind the entire Heater Baseball line-up. Their pitching machines & matching batting cages for youth baseball are perfect for all ages of youth ballplayers. All have been developed for the Heater Power Alley & Heater Slider ball pitching machines. For your older players, I would more comfortably recommend the Heater Slider Dimple Baseballs or the Heater Synthetic Leather Baseballs. They weigh around 1\/2 of a game baseball and are still the same as a regulation size baseball.\u00a0 I hope this has helped you.