Excavate fossil replicas with these kits. Dig through the soft layers of plaster to expose what is underneath using the included tools and descriptive manual. The 3D T. Rex kit includes a 12 skeleton pieces buried in a plaster block. The glow-in-the-dark T. Rex Kit includes 13 skeleton pieces buried in a plaster block. The T. Rex kit includes a skeleton relief buried in a plaster block. For ages 7 and up.