Design: The McCall Curette is a dental instrument designed for the removal of calculus and plaque from tooth surfaces and below the gumline. The specific design, in this case, is identified by the numbers 13-14, likely indicating the size or shape of the curette. Sharp Edge Retention: Instruments with good sharp edge retention are designed to maintain their cutting effectiveness over time. This is crucial for efficient and effective removal of deposits during dental procedures. Durability: Dental instruments, including curettes, are typically made of high-quality materials such as stainless steel to ensure durability. This allows them to withstand the rigors of dental procedures and sterilization processes.