I'm not sure. It is made from hard maple and was created by a French mathamatican. I bought it on a public TV auction for 75.00. It's very cool. The name on the slip said the title is "Grand Pluton". Plutonium? I'm not sure but I have GREAT respect for the maker. Multiple angles, etc. Was told he made only 3 for a trade show. Saw one in a board room of a plush high-rise office in "Murder She Wrote".