http://www.amazon.com/MacGregor-Dimpled-Baseballs-Yellow-9-inch/dp/B000A0F58M/ref=sr_1_1?ie=UTF8&qid=1435360602&sr=8-1&keywords=batting+cage+balls&pebp=1435360630784&perid=15YG7FYFDXX3G9YS24B4
Last forever and are washable!