Description: Identify And Learn: A full-color learning guide has information on each specimen in the set and a magnifying glass inside allows you to see more details of each rock, gemstone, and crystal. Inspire A Love Of Science: Our samples are selected to inspire a fascination with earth science and encourage exploration of the natural world. Rock Collection Mineral Gem Kit: The kits includes 48 different rocks,it is good for the rock collector,teacher or anyone who loves rocks. Great Science Gift For Kids: You can use it as a birthday gift , Easter gift for kids. It have plenty of rocks to identify, nice quality and keep them entertained,it is fun and a great way to pass the time. High Quality: All rocks & minerals are ethically sourced and hand-sorted for the highest quality rocks & minerals available. Specification: Material: Natural Rough Stone Size Chart: Box: 18×11×2.4cm/7.09x4.33x0.94inch Single Gem: 7-9mm/0.28-0.35inch Package Includes: 1 Set Geology Gem Note: 1. This is not infant toy , please take away from kids to avoid eating. 2. Please allow slightly error due to manual measurement. 3. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! 4. Wish you a wonderful on-line shopping!