It's a rain stick and a shaker in multiple directions. It makes a different sound based on how you tilt and shake it. It has a long sustain. Keep in mind, it's a plastic sound. But not bad and fun. I made it for 3mm ball bearings. The center hole is for mounting on a percussion rack and turning it while you play. the other holes are for bolting it together. Enjoy! Check out my turtle cajon.