The Cobb curette (Str 11", 4) is a surgical instrument used primarily in orthopedic procedures, particularly for scraping or debriding bone, cartilage, or tissue. It has a long, straight handle and a sharp, scoop-shaped tip, allowing for precise removal of tissue during spinal or joint surgeries. The "11" refers to the length of the instrument, and "4" may denote the specific size or curvature of the tip, which is designed for different procedural needs.