- Impression trays are made of a strong , rigid material that aids in the generation of consistent, distortion-free impressions. - Compatible with a wide range of impression materials, impression trays offer a system of holes and perforations to optimize flow and retention of materials. - The disposable , preshaped trays can be easily trimmed or flame softened to adjust for a custom fit. Non-slip Grips offer easy, clean removal. Box contains : - 10 different sizes (10 of each size), upper (5 sizes), lower (5 sizes). **For further product information, please contact Chat Support**