This is an ideal Christmas gift for children over 3 years old. A great scientific gift for mineralogy and geology lovers. 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 rock samples. A great gift for girls and boys! This toy can keep your children away from electronic products and reduce stress. You can also practice numbers and counting skills with your children! With the children's collection set, surprise your little geologist, which will inspire you Child curiosity. The countdown to Christmas is an exciting time for children. Using a countdown calendar is a way to increase holiday expectations. This Advent Calendar is a magical Christmas gift, with new surprises every day! The toy advent calendar is a fun way to allow children to count down to Christmas every day and get some surprises every day. Can cultivate the patience of children.