The eight wooden blocks each have a different sensory experience, including a jingling bell, a mirror, pink viewfinder, optical prism, scratchy felt, cylinder squeaker and rattles. Your little one's senses are stimulated through touch, sight and sound - the sensory blocks are made from smooth wood and child-safe lacquers, so are good for taste and smell purposes too! The sensory blocks also double as a stacking toy, as each block can be stacked on top of each other. These stackable blocks are made from FSC® certified materials (FSC® C147826) and are made in the most ethical way possible. The quality of the wood also ensures that it can be played with for years to come. In accordance with current European safety standards.