Powdered fine silver mixed with non-toxic binders and water. PMC works great for creating custom fine silver jewelry and components! Choose from PMC+ (Plus), PMC3, metal clay slip and PMC syringe. We also carry the PMC Easy Squeeze Extruder for use with syringes. The Precious Metal Clay brand of silver clay works best if kiln fired, and most types require a kiln. Shrinkage rates vary per type of PMC, and range from 8-18%.