These are mouth openers, which are made of plastic materials, durable and be used for a long time. Mouth block easily avoid patients fatigue by using our prop, which will make your patients enjoy a relaxing treatment without having to open their mouths all the time. Features -Color:Transparent - :Plastic -Size:11.00X4.00X1.50cm/4.32X1.57X0.59in -Size:12.00X5.50X1.70cm/4.72X2.16X0.67in - Made with plastic materials, details and good workmanship, and will provide you with good service. - prop make the tongue grad block tongue moving so that no injury would happen during the whole treatment. - Mouth applies sufficient pressure to your mouth, which provides you with when you want to open your mouth. - Besides, you also use it for mouth muscle training and protecting! - Keep your mouth open and your hands be used for oral examination and treatment. Package list: 8 x cheek