Specification: * Christmas countdown is an exciting time for kids. Using a countdown calendar is a way to increase holiday expectations. * The Advent Calendar is an amazing Christmas, 24 days, every single day there will be new surprises! * 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 for girls and boys! * 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. * 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 your kid's curiosity and love for science and geology. * This is an Christmas for children over 3 years older. Great Science for Mineralogy & Geology Enthusiasts. Description: Packing Material: paper Size: 210*165*5mm Main Material:stone Optional style: #1, #2 Package including: 1 x Advent Calendar Note: The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. * Christmas countdown is an exciting time for kids. Using a countdown calendar is a way to increase holiday expectations. * The Advent Calendar is an amazing Christmas gift, 24 days, every single day there will be new surprises! * 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! * 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.