HuiSiFang Newton's Cradle Physics Science Toy Balance Swing Ball Decoration for Home and Office Desk SIZE: Size of the black one:19*18*11CM. Size of the silver one:18*11.5*18.5cm MATERIAL: Durable ABS base, nylon strings, stainless steel frame and ball. APPLICABILITY: You can put it on your office desk or your home desk or on your shelf. It will be cool desk toy FUNCTION: Use it to waste time, relieve stress, tune out boring coworkers, or schooling youngsters in physics. OWN YOUR GIFT: Own your special piece of science and explore significant values of physics!