Our company professionally manufactures rare earth oxides. Please look the following specification. Erbium Oxide:99.5% Europium Oxide:99.99%-99.999% Neodymium Oxide:99.5% Lanthanum Oxide:99%-99.999% Terbium Oxide:99.99%-99.995% Cerium Oxide:99%-99.95% Yttrium Oxide:99.999% Praseodymium Oxide:99.5% Dysprosium Oxide:99.5%-99.9% Praseodymium neodymium Oxide:99.5% Ytterbium Oxide:99%-99.999% Holmium Oxide:99.5-99.9% Gadolinium Oxide:99.5%-99.99% Samarium Oxide:99.9% Lutetium Oxide:99.9%-99.99% If you have any questions or concerns, don not hesitate to let me know.