Via Meinl: "The MEINL Wave Drums create the soothing sounds of the surf, with a great new feature: we sealed the little steel balls between two drum heads, one synthetic and the other natural goatskin. This means you can choose between two completely different timbres within the same drum. A sealable filling port allows you to control the amount of steel balls inside."
Features Sealable filling port allows you to control the amount of steel balls inside
Material Rubber Wood (Hevea brasiliensis Muell.-Arg.)
True feel synthetic head