Stop dragging your knuckles on the ground, today you've created an invention to drink liquids without having to put your lips directly into a puddle of brown stale liquid you found on the side of your cave. You've fashioned a drinking vessel from a rock, my guess is you probably took some hallucinogens to further your evolutionary thinking process, after talking to the one true god at the center of the universe he gave you the idea of smashing a rock in a certain way as to make it have a big hole in the center of it so that you can scoop liquids into it and drink from it. The caveman mug is made from ceramic, is dishwasher and microwave safe, and measures 13cm x 10.5 cm x 13 cm.