The HABA Logic Building Blocks are more than mere building blocks! Their system has been especially conceived to stimulate the natural learning process: through play the children discover shapes and quantities, spacial dimensions and physical laws and much much more.Not only do they provide hours of creative fun and entertainment, HABA Building Blocks can be used purposely to foster children's mathematical perception. A wonderful 102 piece beech wood block set made in Germany! Cleaning Instructions: HABA rmends using a cloth lightly dampened with warm water. If you wish to disinfect the toy with a cleaning agent, use a small amount of either water and a mild dish soap or a water and vinegar essence mix. Both options work extremely well in destroying bacteria and cleaning wooden toys. After cleaning, wipe the toy dry with a clean cloth. Remember, Wood is a natural material that soaks in moisture. Do not ever submerse wooden toys in water or place in a dishwasher. Disinfectants (even organic baby wipes), should not be used as they can damage the water based protective coatings applied to protect the stains or paints beneath.