These are clear dice with numbers inked in red, but with blue ink beneath the red numbers. So when you look through the clear dice you can see the blue backside of the numbers. These classic dice have interestingly designed numbers that are easy to read, and the top/bottom ink coloring make them a very unique dice design. This Q-Workhop transparent blue and red dice set contains:
These are standard size, 16mm dice: size guide.