Prestige ORO is a true premium gypsum bonded investment developed and perfected for the casting of gold alloys up to 22K. To achieve the very best casting surface possible, ORO incorporates specially graded refractory minerals and specialized control chemicals that are proven to out-perform all premium investments currently on the market. Prestige ORO have proven to be a truly superior investment for gold that far "SURPASS THE INDUSTRY STANDARD." Package: 30Lbs