The Heater Sports Yellow Dimpled Baseballs provide you with the maximum accuracy and performance available when used with your Heater Sports Real Baseball Pitching Machines. These balls are the same size and weight of regulation leather balls. When hit, these baseballs feel like hitting a regular baseball, without having bat-shock and won't damage your aluminum bat. These are very high quality baseballs and as you can see from the reviews, have been sold for a long time and hold true to their quality. Boasting a very affordable price point, you won't be disappointed in the quality, construction, and durability of the Heater Sports Yellow Dimpled Baseballs By The Dozen.