These Nobo Liquid Ink Dry Wipe Markers write cleanly and smoothly on whiteboards, flip pads and OHP film. The top quality nib uses a pump-action spring to prime the ink ready for immediate use and a clear window in the barrel lets you see straight into the ink reservoir to check at a glance how much ink is left. A standard 3mm bullet tip and liquid ink ensures a clear, smooth-flowing line that is easy to read even from across the room. This pack contains 12 markers in assorted colours, including black, red, blue, green, orange and purple.