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. In order your health, please keep autoclave sterilization after used. for opening the upper and low arch, convenient for operating. Comfortable and flexible plastic. Feature - Color: Yellow, Green and Purple.- Material: Medical plastic.- Size:Large (purple) : 39.5 * 39.5 * 20.4mm.Medium (green) : 34.5 x 36.5 x 17mm.Small (yellow) : 33 * 28 * 17mm. - 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.- In order your health, please keep autoclave sterilization after used.- for opening the upper and low arch, convenient for operating. Comfortable and flexible plastic.Packing list: 3 X Mouth Prop Bite Blocks