CHX30038: Heavy Dice Orange/turquoise 7-Die Set.
These are part of the Chessex Lab Dice Wave 4
Lab Dice are test dice (and only available for a limited time) and allow Chessex to release a lot of colors into the market, using public reaction to gauge which colors are the best to be integrated into their normal dice ranges. To date none of their lab dice previously released have entered main stream production.