NEW Mineral Crystal Stone series 30-day countdown mystery box 6058

Material: natural stone
Process: cutting and grinding
Length: 1-2cm
Function: This coming calendar helps children learn and recognize every rock, gem and mineral in the collection. It can also be a countdown calendar.

Interesting calendar: This calendar has 30 openings and 30 different crystal samples. Every day, there are different surprises for children, bringing lasting attraction to children.