Very clear, excellent for photography. Cold is sterilizable only. Sold in each cheek retractors are made of high-quality medical-grade plastic, materials that are healthy and safe, have elasticity, are consistent with the mouth, and are highly practical. Can be used as a cheek retractor, mouth opener, lip retractor, or cheek expander. Cold and sterilization are compatible. It allows you to see the oral cavity without being hindered. It doesn't make your lips swollen or unpleasant and you can easily obtain a broad perspective for orthodontic treatment. Full view of anterior and posterior teeth and doesn't reflect light. **For further product information, please contact Chat Support**