24k Gold Collection 16x20 Frame 12 Bills Banknotes with COA Certificate ALL COLLECTION 12 BEAUTIFUL BANKNOTES Rare collector's edition These banknotes are thin like paper. So thin gold is extremely fragile each banknote is has been handcrafted with 99.9% pure 24k gold leaf that has been been hot pressed with a special poly-carbonate to give it durability and strength, without it banknote would turn into dust.