On the Giger piece I did I used some real soft steel wool . I am working on another piece for my eldest that has some texture so I decided to try something different with the steel wool . I took an old ink pen and removed the ink cartridge from it and inserted the steel wool rolled up to fit snug in the shaft opening. Then put it all together Then put it to use to see if it would produce the effect I was looking for as shown here in the cape and hat ribbon. It does some really fine micro scratching . Just thought I would share this in case someone else might find it useful.