Description Features: -- Glowing Newton ball swing more dazzling at night, the base has a luminous plate, projected onto the glass beads, glass beads showing colorful, very attractive. -- Not only demonstrates a pendulum, but also shows the Laws of Conservation of Momentum and Energy. Friction and damping effects are also can be observed. Specifications: Product Material: frosted glass + fishing line + plastic baseSize:12x12x9cm Batteries: 4 x AA batteries (Not Included) Package Included: 1 x Science Energy Cradle ToyNote: 1. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures.2. Please allow 1-3cm measuring deviation due to manual measurement.( 1 inch = 2.54 cm )