Also called the waterphone, the ocean harp is an acoustical friction instrument, filled with a small amount of water, which when struck or bowed produces a sound like whales, bow needs Rosin or won't play; made of steel. Each rod is a different tone, played with a bow (regular violin bow, must have rosin too) or mallet. Should be emptied when done playing. Height 16", Diameter 8". Bow sold separately.