Features: Great for car sub, woofers, and loudspeakers. Fall-resistant, will not interfere with the sound. High quality material, durable in use, rustproof, antioxidation. 4 types, 4inch / 5inch / 6.5inch / 8inch, you can select according to your need. Guard your subwoofer from rips, tears and dents. Very sturdy construction and cannot bend or collapse easily. Specifications: Material: Metal, ABS Type and Outer Dia 4in: Approx. 139mm/5.47in 5in: Approx. 169mm/6.65in 6.5in: Approx. 200mm/7.87in 8in: Approx. 245mm/9.65in Note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Grill Mesh Cover