Eclipse Dice are layered dice (4-layers) featuring two ultra-thin bands of pearlescent color sandwiched at the center of the dice, nestled between two clear transparent outer layers When viewed from the top they appear to be semi-solid with numbers that seem to float above a colored surface, but as you turn the die over, the other color eclipses the first! Yet when viewed from the side they appear as 4 layers! An Eclipse Die only happens once in a great while - capture your memory while they're still here! Each die has the high and low numbers centered on the color halves for high-speed number recognition.