Designed specifically for use with PMC3™ and PMC+™, these ceramic shrinkage stoppers help control shrinkage of rings during firing; set includes four shrinkage stoppers, one each of #16, #17, #18 and #19 for making rings size 7-3/4 to 9 (approximate US sizes). After firing, rings are round, smooth and ready to finish.
Each set includes one package of ten 600 x 20mm white ceramic tape strips that prevent the clay from sticking to the stopper and one package of ten 600 x 20mm black alumina tape strips that smooth the inside of your rings as they fire.
The ceramic stoppers are re-usable, and the strips are long enough for firing approximately 50 rings; replacement strips are available (use order #116-476 for ceramic strips and order #116-475 for alumina strips).
Trim each strip to the exact length of the stopper's outside diameter. Wrap the ceramic tape around the stopper, followed by the alumina tape. Place it inside your ring before firing. Your ring will form around the stopper.