The eight wooden blocks each have a different sensory experience, including a jingling bell, mirror, pink viewfinder, optical prism, scratchy felt, cylinder squeaker, and rattles. Your little one's senses will be stimulated through touch, sight, and sound - the sensory blocks are made from smooth wood and child-safe varnishes, so are great for taste and smell too! The sensory blocks also double as stacking toys, as each block can be stacked on top of another. 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 they can be played with for years to come. Conforms to current European safety standards.