The Crush Metal Pigment stacks contain four shades per set, but they actually come packaged in two “stacks,” though you can technically stack all four together. They look much like MAC’s travel packaging jars–they’re definitely much larger than typical 5 gram sample jars. They are roughly the same diameter as a MAC eyeshadow. The texture of these is reminiscent of Solar Bits, though I’d say they’re not chunky bits. It’s like a cross between Solar Bits and some of MAC’s frostier pigments (e.g. Kitschmas).
For your reference, these retail for $32.50 and must be bought either in Stacked 1! or Stacked 2! sets, they are not available for individual purchase. The total weight of the Stacked sets is 12 grams / 0.42 oz.
Stacked 1! consists of four shades: a shimmery medium-dark pink with gold flecks; a lightened, pale pink with light sheen; a dark violet with red undertones and soft violet sheen; and a shimmery icy lilac. I found the icy lilac shade to be the chunkiest, frostiest, and the most difficult to work with out of the bunch. The first two shades didn’t remind me of any pre-existing or previous pigments, but the darker purple reminded me of Push the Edge pigment (but without the violet sheen), while the icy lilac one is like a lighter, icier version of Kitschmas.
The four shades included in Stacked 2! are: a metallic light tan with a gilded gold sheen; a lightly frosted tan-gold with golden shimmer; a metallic yellow-based golden green with gold sheen; and a light, olived-toned green with slightly golden sheen. The tan shade reminds me of a slightly lighter, more metallic version of Tan pigment, whereas the beige-y tan is kind of like Blonde pigment. Neither green really has a great dupe, but they’re in the vein of maybe a much, much lighter and yellower version of Golden Olive pigment.