This upcylcled and naturally sourced DIY rainstick musical sensory bottle will help children learn self-regulation skills. This rainstick calm down bottle is a musical instrument that is fun to watch and listen to. It makes the sound of pitter-patting rain when tipped from top to bottom. Discovery bottles are also great for no mess safe sensory play for kids. Babies, toddlers, and preschoolers can safely investigate small objects without the risk of choking.