Release your inner paleontologist with a little help from our friends at National Geographic™! Each kit contains everything you need for a successful dig including the digging bricks, tools, and a full color learning guide. The Guide provides comprehensive instructions and background information on the kit topic and full color illustrations. Bricks measure 3-4” in length, and are made of gypsum and clay, making them easier for children to excavate. These kits are a wonderful way to introduce a new topic, or provide some productive free play time while fueling curiosity! Adult supervision recommended.