Photo 1 of ANNPER Newton's Cradle – Fun Desktop Kinetic Balance Balls for Home & Office. Perfect for Stress Relief, Science Learning & Physics Education. Engaging Desk Toy for Kids & Adults!

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Photo 1 of ANNPER Newton's Cradle – Fun Desktop Kinetic Balance Balls for Home & Office. Perfect for Stress Relief, Science Learning & Physics Education. Engaging Desk Toy for Kids & Adults!Photo 2 of ANNPER Newton's Cradle – Fun Desktop Kinetic Balance Balls for Home & Office. Perfect for Stress Relief, Science Learning & Physics Education. Engaging Desk Toy for Kids & Adults!