SKLZ Pro-Grade Practice Balls (12 Pack) Improve your baseball swing and get your hits in without having to take long hikes to get your baseballs back. SKLZ Pro-Grade Practice Balls offer great limited flight practice. Get your hits in without having to take long hikes to get your balls back with limited-flight practice balls Builds batting skills without needing a field Safe and durable Includes twelve 9" optic yellow balls