Balls Elastic & Inelastic(Happy and Sad Balls). Pack of 10 Pairs.

GSC International HSBL-01-10 Happy and Sad Balls - Pack of 10 Pairs Elastic and Inelastic Collision Demonstration Sets for Physics and Classroom Experiments Demonstrates the difference between elastic and inelastic collisions Includes 10 pairs of Happy and Sad Balls for classroom group experiments Observe how temperature changes affect bounce height and material response Explore energy transfer sound and polymer behavior during collisions Ideal for physics labs science fairs and material properties demonstrations PRODUCT WARNINGS This product is NOT A TOY. It is designed for educational scientific or professional use only. Adult supervision is required at all times. Improper use may cause injury or damage. Always follow safety guidelines and wear appropriate protective equipment. Not suitable for children 15 and under. This product contains latex which can cause allergic reactions in some people. If symptoms of an allergic reaction occur stop use immediately and consult a physician. This product consists of small balls making it a choking hazard. Only use with adult supervision.