Haba Fun With Sounds Wooden Discovery Blocks With Acoustic Sounds (Made In Germany)Perk up your ears! A lot of different sounds can be heard. Squeaking, clacking, rattling, tinkering.. each cube awaits with a different acoustic effect. In this way, early perception and musicality are fostered. Contents: 6 discovery blocks with different acoustic effects. Pieces made of solid beech wood and colored with a non toxic water based stain.