The In destruct-A-Ball is engineered to keep their shape and prevent cracking like standard practice balls, even after thousands of hits. The proprietary formula was created to flex on impact to prevent cracking along with reducing travel distance. Extremely durable and built to last thousands of hits Lab tested to last 5x longer than traditional plastic practice balls Provide hitters instant feedback on contact Engineered to flex on impact to prevent cracking and reduce travel distance Limited-flight design for easier retrieval For use with all bat types Includes 24 9" diameter balls and bucket.