1 inch 25.4mm Cobalt Metal Cube 145g 99.99% Engraved Periodic Table of Elements

A lovely cube of cobalt. I liked it so much that I ordered a cobalt ring.

These element cubes made by Chinaium are very high quality. Beware of other brands that may not be pure. Some people complain about the corners being sharp, but they are made that way on purpose. You can sand them down, but then you don't have perfect cubes and can't be used for density measurements.