Size 12*12*9cm Age range (description) Kid About this item Newtons Cradle 5 Pendulum BallsGlowing Newton ball swing more dazzling at night, the base has a luminous plate, projected onto the glass beads, glass beads showing colorful, very attractive. No More Boring, Plain Newton’S CradlesIts unique design makes it change to holographic colors when exposed to sunlight or artificial white light, which makes it stand out from many other science or office products. Learning Is More FunNewton Cradle Swing Ball is a perfect way for kids to learn about conservation of momentum and energy. It makes a great present for decorating an office. It is an effective way to relieve stress and frustration for children and office people. Unique CharmPower by Batteries:4 x AA batteries(Not Included). 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. It stays quietly by your side and swings and never stops its noble temperament, when you work hard, or when you are sleeping. Ideal Festival GiftIncludes steel balls, plastic frames and base. A very meaningful gift to make your room or office more classy. When your good friends and family members receive such an exquisite gift, they will be satisfied to exclaim. It will be a thoughtful and satisfying gift.