A math learning kit: 66 barked building blocks cut precisely in heights of 2, 4, 6, 8 and 10 cm. Comes with dice, metric ruler and activity deck in English packed full of fun and challenging puzzles and tasks to teach the basic math principles in 3 skill levels. Lovingly made at our own Wisconsin workshop with reclaimed and sustainably harvested materials. It comes in a fabric bag. Wipe clean with damp cloth and air dry.