I've used the red Jazz IIIs 99.9% exclusively for about 20 years now...not sure what the thickness is, but I use them for electric, acoustic, rhythm, lead, etc. Yearrrrrrs ago I took one of my friend's black Jazz IIIs and it just set in a small box of various guitar stuff for years and broke it out the other day so I alternate between the black and red one. I get years of use out of a Jazz III so with the few I have in a pick holder in that box, I'll likely never need to buy another pack of picks lol