SHUBB capo. Since the radius is tight, I think it's a C4. Capo for acoustic guitar/electric guitar steel strings. This is a world-class capo that uses a one-touch clamp system for easy and reliable capo changes. It is functional, has a beautiful form when attached to the instrument, and is a practical capo loved by a wide range of users, from amateurs to professionals. I apologize if the model number is incorrect. I own multiple Shubb capos and have discarded the packaging, so I don't remember the exact model numbers. I used different capos depending on the radius and width of each guitar. Please make your judgment based on the image.