My first regular pickset measured .023-0.025
I'd recommend acquiring something slightly thinner for slim-line picks. Around .015 is nice for the narrower key ways. You can buy strips of feeler gauge stock to makes picks in any size material they have 0.010-0.035 and everywhere between. Don't go too thin or your picks won't last very long, they will bend and break frequently if the thickness or metal is not correct for the forces being applied to it.