Glitter Cardstock from American Crafts.
Textured cardstock in the most classic and stylish colors. Sold by the sheet - each sheet measures 12x12 inches square.
Personally I would not call this cardstock - I'd call it glittered lightweight cardboard - the thickness is such that one will most likely need a shim when die cutting - I did in my Big Shot and it cut beautifully. It is not very flexible - resembles very, very thick cardstock or lightweight cardboard. The heft adds an air of quality to projects.
The glitter effect is gorgeous - perfect for happy and fun projects. ;)