Glow in the dark shot glasses - set of 4 glow shot glasses with one activator piece. Colours: 1 Red, Blue, Green and Yellow per pack - Each glow shot glass holds 45ml. They will glow for about 4 hours and are a single use glow item.(although the glasses can be reused) - Each glow shot glass has a glow stick concealed in the bottom, use the activator piece to crack the glow stick - These are great for parties. Use them for traditional shots, jelly shots or get creative and use them to serve canapés ! INSTRUCTIONS TO ACTIVATE Activate before filling the glow shot glass with liquid. Place activator piece, flat side down on table or other hard surface. Place shot glass (bottom side down) on top of activator piece; press down on shot glass until you hear a snap. Shake cup and turn upside down to swirl glow around. This product is not dishwasher safe. Do not use with hot liquid. Do not microwave. Do not puncture or cut product. Not suitable for children under 5. Adult supervision is recommended.