features:interesting Christmas Calendar: 24 Types Of Rocks, Gems, Minerals Specimens With 24 Openings (may Contain The Same Stones Or Stones That Are Not Shown In The Picture), With Different Surprises Every Day, Forming A Lasting Attraction For Children.the Ultimate Specimen Collection: A Perfect Independent Collection Or Add To Any Childs Specimen Collection, Including 24 Rough And Polished Ore Samples. Be A Great Gift For Boys And Girls.time Concepts: Geology Is More Exciting Than Breaking Rocks And Finding Crystal Treasures; Calendars Are Also A Great Way To Teach Children Numbers, Time Concepts, And The Art Of Patience.closed Packaging: It Is Difficult To Find The Internal Products From The Outside, Which Increases The Children's Interest, So That Children Can Dig Out Small Surprises Every Day. Parents Can Also Add Special Surprises To Their Children On The Designated Date.the Perfect Gift: Both Children And Adults Like This Gift. Note: Not Edible. Please Do Not Put It In Your Mouth, It Is Not Suitable For Children Under 3 Years Old.Material:stone Size:about21*16.4*5cm/8.27*6.46*1.97in