I can't speak much to bass frets, but on guitars the fret size seems to me to have a great effect on the feel, but pretty much none on the sound - except stainless, which I have not experienced, but I understand to make the tone brighter. There have been at least 2 CoTM basses with mandolin frets ,
The Big Bass and
Rio: Mica says they deliver an almost-fretless sound. She says
elsewhere that the idea came from that interview with Lee Sklar.
As to what's available,
Stew-Mac has 11 types, ranging (width X height) from .053X.037 mandolin wire to a big honkin' .110X.053 (for our metric friends, that's .110mm X 0.94mm & 2.79mm X 1.32mm).
Dunlop's webpage offers 20 sizes, but only identifies them by model number (6240, etc.). You can, however, find a more comprehensive listing - size, manufactor, material -
here.
Peter (who really wasn't aiming for the most-links-per-word record - honest!)
(Message edited by cozmik_cowboy on April 14, 2010)