Toysmith Mysterious Spinning Top Witness the power of electromagnetism as the 3/4-inch silver top spins across the 3-inch platform. Challenge friends and family to unravel the mystery of this continuously spinning top. Powered by an electromagnet using a 9-volt battery (sold separately), this piece makes a great desktop ornament. Give as a gift for anyone in need of office entertainment. This motion display is recommended for ages 8 and up. Challenge your children's imaginations and keep them active with Toysmith. Committed to providing the most imaginative toys along with the highest safety standards, Toysmith has toys appropriate for all age groups. Toysmith offers toys for any kind of play: active play, science and discovery, arts and crafts, impulse and novelty toys, and nostalgic retro classics.