In 2016 the glitter material that Chessex had been using for many years in their Borealis lines began being used in the production of European bank notes meant that it became a controlled substance and Chessex was no longer able to obtain it. However, in 2019 Chessex unexpectedly found remaining stock of the old glitter in one of their warehouses. Thus Maple Borealis Green/yellow was born!
These dice are now extremely limited in supply and becoming more difficult to obtain.