These dental instrument trays are made of high-quality PP (polypropylene) material, which is durable, lightweight, and easy to clean. They are divided into different sections to organize and store different types of dental instruments, such as scalers, curettes, burs, and dental mirrors. The trays are autoclavable at 134°C for 15-20 minutes, making them safe and hygienic for repeated use. They are suitable for use in dental clinics, hospitals, and dental schools. The size of the trays is B, which can hold a variety of dental instruments, including those used for restorative, orthodontic, and endodontic procedures.