Funny Science Coffee or Tea Mug - Lab Rule #5 - All Unmarked Beakers Are Deadly Coffee or Tea Mug Great gift for science and chemistry geeks. Dishwasher / Microwave Safe - Ceramic Holds 11 oz / 325 ml of your favorite beverage Lead Free, Printed in the US with non-toxic, earth friendly, permanent inks WARNING! Due to the popularity of Neurons Not Included mugs, several unscrupulous Chinese vendors are now selling poorly copied, unauthorized knockoffs of our products. If you buy a Neurons Not Included mug from one of these copycats, youre getting a mug made who knows where, using mugs of unknown quality, using inks that may or may not be safe, and if you need to return it good luck with that. Make sure youre buying from Neurons Not Included to get the real deal!