This petrified rainbow petri is just under 3 inches in diameter and about 1/2 inch thick--about the size of the palm of your hand or a deck of cards. You will receive one petri that has been made in a small batch. Each petri is a unique, handmade, one-of-a-kind art object. The limited batch editions are made with a consistent palette and composition, you will receive one from the batch at random. They come with a piece of reusable adhesive if you wish to attach it to a wall, or your dashboard, or you can purchase a clear Lucite stand to display your petri on a desk or shelf (see below). You can also just hold it, you spend too much time with your phone anyway. Fast and free shipping in the USA, $12 international.