You're looking at 25 grams of Precious Metal Clay Pro (22.5g Silver weight) that becomes silver at 760 degrees centigrade with 10% shrinkage when sintered in activated carbon.
PMC pro is a very strong grade of PMC silver clay alloy that is 90% silver and 10% copper with among the lowest shrinkage rate out there.
PMC Pro is manufactured in Japan by Mitsubishi Materials. Please note, you must fire PMC Pro in a bed of activated carbon to ensure it will sinter properly. Only mix with PMC Pro.
Comes in an air-tight resealable container. Detailed English instructions in the pack.