Castaldo SuperStretch™ is able to mold hollow gold spirals (such as in a sea shell charm) without complicated multi-part inserts that are strong and elastic enough to be withdrawn from wax patterns 100’s of times. Just look at the shine! SuperStretch High Shine Finish means less polishing. Cuts like butter. Easy mold packing / easy mold cutting. Low rubber shrinkage – only 1.3%. SuperStretch is compatible with other Castaldo silicone molding rubbers – can be used alone or used as an insert for special projects.