A Neck Stretcher So Real - So Tempting The Perfect GAG! For the Home - Bar - Parties Liquid Moves in the glass but wont come out or spill. Made of glass. 4" tall. Each comes in its own box with instructions. You can even do a magic trick with this glass. Cover the brandy glass with a card, turn both upside-down, and then remove the card with-out spilling the drink! Easy to do! If you look real close you can see how this is done. The liquid is inside the walls of the glass.