These are cool! I met a music therapist who had one of these ocean drums and also a rain stick. I had seen rain sticks before, but this drum (with authentic Remo drum head) was new to me. I found it incredibly soothing. It sounds like an ocean wave when you turn it over slowly. And with none of the sensory drawbacks of an actual ocean, this is approved for Aspies and neurotypicals. Available here in three sizes.