These Montessori learning toys are made of high-quality wood. There are no rough or sharp edges. Each piece is coated with water-based non-toxic paint which is odorless. -The easy-to-grip nails and pictures under the broken pieces make these four excellent pairing activities ideal for learning and motor skills development. -Accompaniment is the most important thing in children's growth. Children will be happy to see everyone joining them while playing the game. Kids of all ages can get their basic skills formed while having fun.