This is how the fun works: slide the balloon inside through the slot in the case, blow up the balloon until the case is full. Don't knot the balloon, but push the twisted end under the flap of the balloon sleeve. Material: 100% cotton, tested for harmful substances (fabric of HOPPEDIZ® baby slings) Care: washable up to 60 °C Dimensions: Ø approx. 25 cm One size includes: 1 balloon case with 2 balloons