Zig Memory System Brushables Marker, Carded, Powder Blue This brushable marker features a dual tip with two brush tips Ideal for paper crafts and stamping projects because the ink is photo-safe, acid free and lightfast Perfect for creating unique brush layering effects Must be stored in a horizontal position, if they are not positioned correctly this will result in one of the tips becoming dry and unuseable Conforms to astm d4236 standard; available in powder blue color