Dingang Z-shaped Frame Newtons Cradle Metal Balance Ball ABS Base Desk Toy(Silver) HIGH QUALITY --Stylish and innovative design. Stainless steel swinging balls and base. VERSATILE -- 1. An exquisite decoration that can be placed in house,school or office 2. Educational purpose 3. Psychological purpose GREAT GIFT IDEA -- An exquisite gadget gets everyone's affection and makes a lively office decoration or executive gift. MEANINGFUL -- Excellent educational & science gadget, own your very own piece of scientific history and explore significant values of physics. Dimensions:Size:18x11x19cm/7.09x4.33x7.48inches.