I am blaming my deterioriating memory for this one...last year at Blackpool champ show I bought a pack of three pink 'pencils' to try out--they are like a very fine emery stone, for fine detail work and about 8cm long and only maybe 1cm square in cross section. I was quite impressed with them and handed a couple out to friends to try.  I only have a tiny stump of a pencil left and I'd like to get some more. The trouble is I can't remember where I bought them, or what on earth they are called :(  Has anyone ever come across these? I'd be very grateful if anyone can tell me where I can get some more.