Pedra do fel, Ox gallstone Niuhuang. We are full time exporter of high quality natural ox gallstone/cow Bezoar. Our product obtained from disease free cattle. We can supply up to 1 kgs monthly. Shipment prompt by air courier (DHL). Price depends on ratio of wholestone / brokenstone. At moment for 80% whole / 20% broken. US$ / kg C&F destination. Contact us if interested.