Intraoral supporting device：5 Sets of Large, Medium & Small. Packing List：15pcs for sale= 5pcs Large+5pcs Medium+5pcs Small Idea for opening the upper and low arch, convenient for operating. Soak Disinfection Recommended：In order your health, autoclave before use. Brand New and High Quality：comfortable elastic have medical plastic material Easily avoiding patients fatigue by using mouth prop, make patients enjoy a relaxing treatment. Tongue grad block tongue moving so that no injury would happen during the whole treatment.