No idea what this should come under but basically:
1 pack = 4 permanent markers Black, Red, Blue, Green = £4
or buy 2 packs for £3....
bit of a bargain imho, much better quality than the cheaper stuff.
not online i dont think but was instore with a yellow SEL and a red 'any 2for £3' label.
i have a pic but dont know how to upload, i can email the pic tho if anyone would like to confirm it :)