Zig Memory System Calligraphy Dual Tip Markers, Pure Red pack of 6 Marker features a dual tip with 2.0-mm narrow and 5.0-mm broad ends Double tipped, one end has a 5.0-mm square tip while the other has a 2.0-mm square tip An exciting marker which opens up new possibilities in the art of fine handwriting Water-based ink that will not bleed and is photo-safe and waterproof Archival quality, lightfast, acid free