This is a set of 4 pint glasses. They are 16 ounces each, & are real glass. Each has a different 16-bit style pixel art of a character, so you get foot tapping/waiting annoyed Sonic, yawning/waiting tails, thumbs-up Knuckles, & Eggman in his Egg o Matic. The gimmick here is that the blue exterior appears pearlized/shimmer & the interior is silvery metallic colored.

The shiny stuff shows through the frosted-like blue part to give the effect. The metallic tone is likely actual metal coating embedded in the glass....so these are NEITHER microwave NOR dishwasher safe. (Metal is bad for both) The photo at right shows them MIB on a Spencers Gifts shelf. Notice how poor Eggman is hidden behind the logo. Reportedly, all such 'fancy glasses' should actually never be used because while they look nice, the paint chosen is actually really poor & just comes off. Buy for display only! These can be bought at ThinkGeek.com online, and Spencers Gifts. The set should be about 24.99 when you find it.