This set includes 2 different species of Trilobites: Acastoides & Calymene. Each set also includes a small Trilobite information card. The Calymene trilobites are large, measuring about 2.5-3.5 inches long! The Acostoides Trilobites are very small, measuring .25-.5 inches long. This trilobite will arrive in a small plastic magnifying display case, measuring 1 x 1 x .9 inches. These are natural fossils (from Morocco) that are millions of years old! Each one will be slightly different in shape, size, color, and appearance. Purchase direct from Gold Nugget Miner, each Trilobite is hand selected and packaged with care in the USA!