This WonderGoo promotional P5R round bottom glass was only sold with the exclusive limited box set in Japan or seperately for around 10,000円 ($100) until they ran out of stock.  Looks great with Red or White wine (or juice...).  You may or may not shrink to the size of a house mouse, ymmv.

 
Product Weight
0.325 kg
Product Measures
13cm x 10.5cm x 14cm
 

~Not available for Lettermail due to size and mice~