Feature: The countdown to Christmas is an exciting time for children. Using a countdown calendar is a way to increase holiday expectations. Advent Calendar is a great Christmas gift, and every day has a new surprise This Advent Calendar is made of high quality, safe and nontoxic materials, and is suitable for adults and children over 3 years old. Include rough and polished samples of rock. Make wonderful gifts for girls and boys This toy can keep your children away from electronic products and relieve stress. You can also practice numbers and counting skills with your children Provide children with rock collection kits, and surprise your little geologist, which will stimulate your children's curiosity and interest. This is an ideal Christmas gift for children over 3 years old. Great scientific gift for mineralogy and geology lovers. Discover the crystal treasure Each kit contains a broken crystal hole and two complete crystal hole specimens for you to open by yourself. Geology is nothing more exciting than opening rocks and searching for crystal treasures. countdown is an exciting time for kids. Using a countdown calendar is a way to increase holiday expectations. The Advent is a amazing gift, 24 , every single day there will be new surprises advent calendar is made of high-quality, safe, non-toxic 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 boysThe toy advent calendar is a fun way to allow children to count down every day until and get some surprises every day. That can develop their patience. toy can keep your child away 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. an gift for children over 3 years older. for Mineralogy & Geology Enthusiasts. : : Advent Weight: 256g ur:As shownMaterial: Size:21 x 16.4cmPackage Contents:1 * Advent the above package content, products are not included.Note: shooting 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.