Stone: About 10 to 20mm Box size: 13*12*1.2cm 20 Pcs/box: About 65g Material: natural mixed ore Package List 20* Christmas stones Due to the lighting effects and shooting angles, there is color difference in the product, please understand.Due to manual measurement, there is a tolerance in the product size. 11. The countdown to Christmas is an exciting time for children. We have designed a set of fun Christmas Advent calendar toys for children. After 20 doors, children can take out the Christmas gifts corresponding to the date in the box from the drawer. 22. 2021 Advent Calendar for Adults helps to understand and identify each type of rock, gem and mineral in the collection. It can also be a countdown calendar. This blind box contains 20 different colors/shapes of ores. Calendar for 2021. This blind box contains 20 different colors/shapes of ores. 33. Reusable decoration. These soft natural ores can be reused. This Christmas Advent calendar is very suitable for Christmas decorations in homes, schools, dormitories, children's rooms, etc. 44. The perfect Christmas toy, suitable for children's birthday party gifts, gifts, daily gifts, school prizes, preschool props, teaching aids, parent-child interaction and holiday gift bags. 55. Most of these gifts are exclusive products designed for the Advent calendar. All gifts are unisex and are perfect gifts for anyone. A magical Christmas rock storage gift box.