Perfect for party tricks! Lots of "ooohs" and "ahhhs" a the dinner table, sure to keep everyone's attention and make tea drinking way more interesting for the newbees! This is a 20 oz. BPA-free (safe, hard, indestructable) plastic and stainless infuser (within the construction) that makes tea prepraation a breeze. Place loose leaves in the top, add water, wait a few minutes as tea steeps, then set on top of mug to release valve, and out it pours! We've "field tested" them here for a couple of years now and they are fabulous!!