Welcome、Please read the following instructions¡£Features:100% Brand new and high quality!The fun of Ferrofluid in a mess-free、 sealed display bottle.Hard、 impact resistant glass offers easy viewing and interaction with ferrofluid.Each glass bottle contains full suspension solution (mostly water、 plus some secret ingredients) and a glob of ferrofluid. Specifications:Material: Magnetic fluidSize: 30*30*100mmColor: Blue; Green; Red; Yellow; Black; White Package included:1 x New Toy Ferrofluid Magnetic Display in Glass Bottle Puzzle Game Kid ScienceI wish you happiness.