They come in lots of colours I got mine at Hobbycraft for £3.49. The tip was too thick for what I wanted to do maybe if I cut it to a point it might have been better.
Coming along nicely now got the wheels on and the glazing. Unfortunately the cracked canopy is never going to be perfect but a couple of coats of gloss varnish have toned down the cracks.
Transfers next I have got some 35inch prewar decals for the wings and 24inch for the fuselage. I might see if I have some spare blue/red decals for the full on stealth look