Desks -Newton Cradle Balance Balls Highlights Generic Brand Newton Cradle Balance Balls Description: This is a DIY Pendulum Wave Ball, so some simple assembly work is required before using. After assembling it, you will play it with a great sense of accomplishment. To make the glass balls move, simply push it slowly with the provided wooden band, then gently loosen it. Office decor, show character and express your love for science and physics with this decoration of your office space. For kids handmade, experience the visual momentum display educational classroom, use it in the classroom, and share with friends and family the exciting world of physics and science. Quality materials, made of durable wood and glass, and the majority of the gadget is made of sturdy plastic metal. specification: Material: Wood, Metal Color: wood Size: 200x100x140mm / 7.87x3.94x5.51 inch Package includes: 3 pcs plate 5 pcs glass balls 1 pcs screwdriver Set of 5 black screws Number of white screws Number of sleeve tree T-shirt 5 pieces Isolation column 2 pieces Lines 1 piece Axis 5 pieces