Castaldo® Quick-Sil® is a revolutionary new 0% shrinkage jewelry molding rubber material that makes tough, long-lasting production molds with a high-shine finish ALMOST INSTANTLY. - No careful measuring - No messy liquids - No 12-24 hour wait for finished molds - No vulcanizer needed - No release sprays needed -- it's self lubricating - Can be used for direct casting of pewter & other low-temperature metals! Castaldo® Quick-Sil® molds are not weak, delicate prototype molds that can be used only once or twice. They will last for hundreds of uses and dozens of years. Castaldo® Quick-Sil® can be used for lost wax casting and can also be used for direct casting of low-temperature metals such as pewter, tin, etc. Castaldo® Quick-Sil® is packaged in a 2-lb. / 0.9 Kg. kit containing equal parts A & B.