Shapton RockStar Complete Progression BundleAccessories Information The Rockstar Series from Shapton improve on the GlassHR Series by removing the glass backing, and adding extra stone thickness for a longer lifespan. They are a hard stone that offers lighter feedback levels than other stones, but cut very fast, require no soaking, and are very slow to dish. This full progression includes the 320, 500, 1000, 3000, 6000, 8000, and 16000 grit stones, plus a holder.