These are laser-cut Acrylic bases with a sci-fi hexagon pattern etched on them.
They come in clear, but are easily painted with standard paint.
They are almost exactly the same size as a US Penny.
Check out the Videos tab soon for tutorials on how to cut off the integral base on many 15mm miniatures and attach it to the Acrylic base.
They come 12 to a pack.
Note: They are laser cut and because of that they might have some cosmetic laser marks that will not effect painting.