Description:The Rock and Mineral Kit has 20 random stones in the box, which is an interesting and educational toy for children. It can be used as an interesting collection as well as jewelry-making materials like DIY necklaces and bracelets. It has colorful stones to attract the attention of children and they will love the geology world.Specifications:Name: Rocks and Mineral CollectionMaterial: OrePackage Size: about 130*150*30mm / 5.12*5.91*1.18inchesOre size: about 10 to 18mm / 0.39 to 0.71inchesRock Style: RandomPacking List: 1* Rocks and Mineral Collection ( including 20 pieces of random stones )Notes: 1. Due to the lighting effects and shooting angles, there is a color difference in the product, please understand.2. Due to manual measurement, there is a tolerance in the product size.