This is a preorder! They will ship mid June. 
(For series 2, click here: http://skeletaldropkick.com/product-page/preorder-blind-box-micro-mugs-series-2)
Introducing Blind Box Micro Mugs!
In Series 1, each box contains one of the following designs:
Axolotl
Bat
Creature from the black lagoon
Mothman
 
Which one will you get? Nobody knows? That's the fun :D
I made 4 of each of these designs. Each box has an original and completely random drawing on it.
They measure about 0.5" wide and about 0.5" tall. Seriously small. Dishwasher, food, microwave and oven safe, although I am not sure why you want to do any of those things with them.... hmmmm.....