This is a pediatric mask for Drive/Devilbiss Nebulizers, but it's also capable of fitting most standard nebulizer kits. The Drive pediatric mask is made of soft plastic and includes an elastic strap for a comfortable fit. This mask focuses the medication to make nebulizer treatments more effective for your child. You have the option to purchase as a single unit or in a pack of 5 masks. This mask is meant only to be hand washed.