Use these water based Glow in the Dark Marker Pens for all kinds of crafts and parties. These pens are glow in the dark which means they can be charged with any light and will continue to glow when the light is turned off. They will also glow under any blacklight. Applications to clothing walls or other surfaces will not be fully removable. Easy clean up with soap and water while still wet. Conforms to ASTM D4236 5 Pens; 1 of each color: Yellow, Orange, Blue, Green, Pink .35oz per pen Re-sealable caps Not recommended for children under 13.