Check out this category for Fine silver (.999), Sterling silver metal clay (.925) and 950/960 silver content metal clay (one fire sterling)
Original Metal clays, fine silver. Some like Art Clay silver may even be fired with a butane torch
Sterling metal clay - same silver and copper content as commercial silver jewelery. Must have kiln to fire.
This is a combination clay - Between fine silver and sterling.High silver content like fine silver but with strength of sterling metal clay.