Newton's Cradle Balance Pendulum - 7x6x7 Inch Swinging Kinetic Balls Desk Toy Newtons cradle demonstrates the third law of motion with swinging spheres. When one ball is lifted and released, it sends force through the rest, pushing the end ball in the opposite direction. Display the physics desk toy on your desktop or in the classroom to teach young children about physics. This office desk toy can also make a great gift for coworkers and your boss. Recommended for ages 5 years and up. Assembly acquired- insert the frame into the base. MORE BENEFITS Functionality and Design: Add a touch of elegance and entertainment to your desktop accessories and decorations with these swinging kinetic balls, also known as Newton's Cradle balance balls Educational Value: Newton's Pendulum balls are not just a decorative accessory but also serve as an excellent tool for learning science or physics, or as a stress reliever Reliable Quality: Our Newton balls desk toy is made with stainless steel bars, the pendulum balls have a reflective mirror finish, and the base is a lightweight plastic to add to your satisfying toys Specifications: This fun "perpetual motion" stand designed for physics demonstrations measures 7.0 x 5.8 x 7.1 inches, making it a great size for table top use or desk decorations in the lab or at home Desk Relaxation: You will receive 1 Newton's cradle pendulum, perfect for adding to your collection of fidget toys, desk gadgets, knick-knacks, and accessories with a touch of calm to any workspace SHIPPING We offer FREE shipping on all orders! We ship within 3 business days of payment, usually sooner We use a selection of shipping services such as UPS, FedEx, USPS etc We only ship to the lower 48 states, no APO/FPO addresses or PO Boxes allowed PAYMENT We accept payment by PayPal only - Can accept all kind of credit cards Before buying, please make sure your PayPal and eBay address is correct. If not, please correct it before payment. We have confidence in our products, but if you are not fully satisfied please contact us within 30 days of purchase and you will get full refund. Return the product in the same condition you received it. Please note - return shipping will be paid by the buyer. CUSTOMER SERVICE We try our best to make sure every customer is completely satisfied. If there's a problem, feel free to message us! We're happy to help.