Features:1. Compatible with sterilization and the autoclave (<130°C).2. Can be as Cheek Retractor/mouth opener/ Lip Retractors/ Cheek Expanders.3. Health and safety materials, elasticity, consistent with mouth, very practical.4. Smooth surface is more comfortable.Description:Shape: O-shapeMaterial:Polyvinyl chlorideColor:WhiteDimension: approx. 7 x 6.8 cm / 2.76 x 2.68 inchInstructions:Stretched in the vertical direction of the patient's mouth for the treatment of front teeth area, orthodontic treatment to adjust the effect is very good.Package Included:4 X Cheek Retractors Notes:1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness.2. Please allow slight deviation for the measurement data.