MaterialBeech, light and natural, healthy and nontoxic. Safe enough for children and adults. Unique and interestingwood stones are handmade and unique. Many different shapes and sizes, they are fun to hold and stack. The recommended age is between 2 and 100 years old. Advantagesstimulate creativity and use imagination. Encourage baby's hand, eye, and brain coordination skills, promote color recognition and fine motor skills to stimulate children's imagination Puzzle gamethis toy can help babies increase their curiosity and introduce it to the first stage of problem solving according to the way of solving the problem Practicalityeach piece has been selected, polished and polished to make the surface smooth enough and safe for children and adults