A 10mg micro ampoule of Rubidium metal. Purity is 99.99%.  The glass ampoules have a yellowish tint to them but the metal inside is silvery.  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.