Decorative objects -30 Pieces Rock & Mineral Collection with Collector's Box/Beginner Showcase, children's Gemstone Kit, STEM Geology Highlights generic brand 30 Pieces Rock & Mineral Collection with Collector's Box/Beginner's Showcase, children's Gemstone Kit, Geology STEM 30 piece collection of rocks and minerals and a premium clear acrylic collection box. Educational set for the rock collector, teacher or anyone who loves rocks. Samples are approximately 3.5-5.5cm in length. Perfect for the beginner or seasoned gemstone collector. And it can be used on classroom, home decoration, inspire your imagination. specification: Size: 3.5-5.5cm/1.37-2.16inch Package includes: 30pcs Rock and Mineral & Deluxe Collection Box Note: Please allow 1-3mm measurement deviation due to manual measurement. Due to the different monitor and light effect, the actual color of the item may be slightly different from the color showed on the pictures.Thanks