The Israeli Mint has minted two sets of coins for this purpose: an edition of 20.57 gram silver commemorative coins, five of which would come to 102 grams of silver, and a special edition 26 gram silver commemorative coins, five of which would come to 130 grams of silver. Pre-1936 American silver dollars (commonly known as Morgan dollars or Peace dollars) weigh 26.73 grams of 90% silver content and hence contain 24.06g of pure silver, although such coins have become increasingly rare (modern U.S. coins contain no silver). Four American Silver Eagle coins, specially minted coins sold to collectors and investors which contain 31.1035 grams of 99.9% pure silver, or five of the above-mentioned specially minted silver coins of Israel are commonly used for "pidyon haben" in the United States. One may use silver bullion as well; it is not necessary for it to be a coin per se.