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[STEEL BALL QUALITY] Made with bright steel balls and durable nylon wire this Newtons cradle is anti corrosive rust resistant and built for long term desktop use with a clean classic look. [STRESS RELIEF DECOR] This balance ball desk toy brings soothing motion and a crisp visual rhythm to your space making it a fun stress relief accessory for office desks home tables and study rooms. [CLASSIC PENDULUM ACTION] Lift one ball and release to watch the others swing in response creating an engaging perpetual motion style display that is enjoyable for adults teens and curious children. [SCIENCE LEARNING DISPLAY] More than a desk ornament this physics pendulum model demonstrates momentum and energy transfer in a simple visual way helping explain Newtons ideas during play or study. [COMPACT GIFT SIZE] Measuring about 8.5 x 7 x 9 cm with 5 small balls this silver science toy fits easily on desks and shelves and makes an elegant gift for friends family students and teachers.