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Premium vaults are the finest vaults made. They are usually triple-walled with an outer concrete wall, an inner re-enforced plastic liner, and a metal liner. The plastic liner is often made of an ABS fiber-filled plastic. The metal liner is made from bronze, copper, or stainless steel. The metal and plastic liners add strength, beauty, and shock absorption qualities to the vault. Premium-grade vaults normally carry a 200-year warranty.