The eight wooden blocks each offer a different sensory experience, including a jingling bell, a mirror, a pink viewfinder, an optical prism, scratching felt, a squeaker, and rattles. Your little one's senses are stimulated through touch, sight, and sound – the sensory blocks are made of smooth wood and child-safe lacquers, so they are also great for taste and smell purposes! The sensory blocks also serve as stacking toys, as each block can be stacked on top of the next. These stackable blocks are made from FSC®-certified materials (FSC® C147826) and are manufactured in the most ethical way possible. The quality of the wood also ensures years of play. Compliant with current European safety standards.