1Made of quality silica gel, non-toxic and odorless, good toughness and durable. 2If you squeeze the building block, it will emit some sound, which is very interesting. 3This puzzle toy set helps promote baby's imagination and intelligence development. 4Bright colors and cute modeling attract baby's attention, promoting visual development. 5Moderate size is easy for baby to grip, exercising baby's fingers' flexibility and grasp ability.