A 10mg micro ampoule of Rubidium metal. Purity is 99.99%. These small ampoules are very safe to own and present practically no danger if the ampoule breaks. They are the perfect size for collectors who want a small sample of this highly reactive metal. These will fit nicely inside a 5/8dram vial and one will be included with every purchase. Please check my Bonanza store for more element samples. I have almost every collectible element available. Thanks for looking.