These ceramic ring sizers do not burn nor shrink during sintering. When the PMC or metal clay sinters, it shrinks around the pellet, making the ring molds to the precise diameter of the pellet.
PMC Precious Metal Clay 30 Piece 20mm Silver Art Clay Reusable Ceramic Ring Sizing Pellets Firing Set, for Jewelry Making
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Metal clay and Silver-clay make real jewelry out of fine silver. – Silver- Clay.com
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