Practically unknown to the public at large, rhenium is a super dense and very hard noble metal remarkable for a number of desirable characteristics. Low price however is absolutely not a trait that accompanies this little known precious metal. 

According to the CRC Handbook of Chemistry and Physics, arguably the most authoritative reference on these subjects, rhenium is the rarest stable metal found in the earth's crust at just 0.7 parts per billion making it about twice as rare as iridium and osmium and over five times rarer than gold!

Gleaming white and perfectly made, these rhenium cubes are the only (reasonably) priced density cubes that are heavier than tungsten or gold at a satisfyingly hefty 20.5 grams each, which is just shy of its 21g theoretical density.

A beautiful and interesting collectible sure to delight! Comes with mirror polished surfaces as standard.

25.4mm cube weighs ~320 gr.