3-layer dice with transparent top and bottom layers. Mint Green - Silver Numbering. Neutron Dice are layered dice (3) featuring a shining band of pearlescent color as the center layer, nestled between two clear transparent outer layers! Made of high-impact resin, with the same original layering process we invented for Halfsies Dice in 2013 that prevents air-bubbles from forming inside, Gate Keeper Games dice bear the honor of being the heaviest, densest, and most well-balanced resin dice on the planet! Made in China.