This Castaldo® Super High-Strength silicone mold rubber strip has a medium-hardness with extreme tear and tensile strength. It's a general-purpose rubber, and works well for spirals, cores, plug and cut-outs. No release agent is required with this mold rubber, and shrinkage is just 2.3%.
Castaldo®—known throughout the jewelry industry for performance, dependability and value—manufactures mold rubber trusted the world over.
Sold in a 5-lb. pack.