Using high-quality building blocks. Each piece has been polished and smooth,safe and environmentally friendly paint, bright colors and Non-toxic. It includes 4 Colors Memory Chess(one side with pattern, one side solid color) with 18 cards.Randomly pick up a card, and move the corresponding card to the corresponding position according to the corresponding color on the card. Memory games are great for kids, it is builds children's thinking skills, enhance brain flexibility, concentration and attention span, hands-on ability will be greatly improved. Recognize colors and patterns by playing, makes a fantastic gift and watch your child improving with every round games(Suitable over 36 months child)