Kiln-Annealed Stainless Steel Earhooks Lampwork Glass NWOT Annealing is one of the steps of firing glass. Kilns are programmed to slowly cool (anneal) glass to eliminate any stress after it is formed. Glass pieces may crack or shatter when subject to small temperature change or mechanical shock and annealing glass is critical to its durability. The Silver-Plated spacer beads are not glued and may pop off to the side if knocked around. It's super easy just to reposition them in place with your finger if this happens. No two beads will ever be alike in this process!