Model: FL 10SG Key: C, 16 covered keys Body Material: Cupronickel Finish: Silver plated body, Gold Plated key Key System: Offset G E Key Mechanism: Without Length: 660 mm Outside Diameter: 20 mm Inner Diameter: 19 mm Accessories: Cleaning Rod, Cleaning Cloth, Joint Grease Packing: Durable Plush Lined Hard Case