Our Blue Luau 12 oz Glow Cups with a hibiscus design imprinted on the outside is perfect for restaurants or Hawaiian Luau themed events. Great item for that signature drink. Use the cup as a giveaway souvenir. Sold by the piece. This cup will glow 1 time only. GLOW ACTIVATION INSTRUCTIONS: Not everyone has the hand strength needed to crack the glow ampules by squeezing. If you find it too difficult to do it by hand, an easy solution is to find the ampule on either side and press it against the edge of a table or bar until you hear it crack. Do the same to the other ampule on the other side of the cup and watch the cup begin to glow! Give the whole cup a good shake to mix and disperse the glow, then..... ENJOY THE EFFECT. Please order in increments of 1 cup.