Sensory bottles have been used by parents, teachers, and therapists to help children self-regulate their breathing and improve their focus. Jellystone Designs' award-winning DIY Calm Down Bottle is a unique sensory bottle, where you receive all the creative elements required to create a sensory bottle perfect for your child. Just add warm water and a dash of washing-up liquid and it's ready to go! With this option, you can refill and reuse the sensory bottle for endless creative options. Dimensions: 21cm x 5cm diameter. Care Instructions: The Silicone Caps can be cleaned using a steriliser, placed in a dishwasher, or washed with warm soapy water. Refreshing the contents of the bottle is up to the user's discretion however, we recommend emptying and refilling every few months.