1. Christmas countdown is an exciting time for kids. Using a countdown calendar is a way to increase holiday expectations. The Advent Calendar is a amazing Christmas gift, 24 days, every single day there will be new surprises2. This advent calendar is made of high-quality, safe materials, suitable for adults and children over 3 years old. Includes rough and polished samples of rock. Makes an excellent STEM gift for girls and boys3. The toy advent calendar is a way to allow children to count down every day until Christmas and get some surprises every day. That can develop their patience.4. This toy can keep your child from electronic products, reduce stress and you can also practice numbers and counting skills with kids And with rock collection set for kids and surprise your little geologist that will spark your kid's curiosity and l.5. This is an perfect Christmas gift for children over 3 years older. Great Science Gift for Mineralogy & Geology Enthusiasts.Weight: 300gThe interior contains 24 different oresColour: as shownMaterial: stoneSize: 21 x 16.4 x 5cmPackage Contents: 1 Set x Christmas Ore ToysOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.