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 surprises 2.This 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 boys 3.The toy advent calendar is a fun 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 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 . 5.This is an perfect Christmas gift for children over 3 years older. Great Science Gift for Mineralogy & Geology Enthusiasts. Weight: 400g The interior contains 24 different ores size:21x16.4x5cm Material:Stone colour:As shown Package Contents: 1 Set x Christmas Ore Toys Only the above package content, other products are included. e: Light 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.