Use these water based Blacklight Responsive Marker Pens for all kinds of crafts and parties. These pens are blacklight responsive and 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. These markers are a squeeze type marker that produces a beaded line. Clothing, walls or other surfaces will not be fully removable. Includes 5 Pens; 1 of each color: Yellow, Orange, Blue, Green, Pink .35oz per pen Re-sealable caps Not recommended for children under 13 Easy clean up with soap and water while still wet.