Educational function: the stone collection set designed for children surprise your little geologist, which awaken your children's curiosity. The Christmas countdown calendar helps relieve stress and improve concentration. It is also a great way to teach children numbers, time and the art of patience. Safety material: Christmas crystal advent calendar is made of high-quality, safe and non- materials, is safe, and . The ore is finely polished and polished and the feel is very good. It is smooth enough not to hurt children's hands. It is an excellent gift for girls and boys. Strong festive atmosphere: the Christmas countdown is an exciting time for children, open the small door to reveal the surprise stone. Every day from December to Christmas is a fun experience, with a countdown calendar a way to increase your holiday expectations. This is a collection of crystals, stones and stone minerals from around the world to give children different surprises and fun for 24 days. surprise: 24-piece ore box crystal advent calendar, which contains many crystals, natural ores and raw stones, which express happiness and happiness, are naturally valuable and can be collected forever. With daily changing surprises that make a lasting for children. Widely used: the crystal advent calendar is suitable for girls, boys, children, adults and teenagers to meet the needs of different age groups. Crystal repair stone kit also suitable for children's birthday gifts, daily gifts, school prizes, preschool props, teaching aids, parent child interaction and bags. Note: Cannot eat. Please do not put in the mouth, children under 3 years are not suitable for use. Colour: As Shown Material: Ore Package Contents: 1*Christmas Advent Calendar Only the above package content, other products are not included. Note: Light reflection 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.