Product Features: Brand new and high quality. Enhance your listening experience, providing a sweeter sound. The surface is smooth and pleasant to the touch. For your health, please replace or clean it every three to six months. Product Specifications: 10 inch: Frame Inner Diameter: 236 mm Diagonal Screw Hole Center to Center Distance: 261 mm Outer Diameter: 275 mm 8 inch: Frame Inner Diameter: 210 mm Diagonal Screw Hole Center to Center Distance: 184 mm Outer Diameter: 1221mm 6.5 inch: Frame Inner Diameter: 171 mm Diagonal Screw Hole Center to Center Distance: 145 mm Outer Diameter: 184mm 5 inch: Frame Inner Diameter: 142 mm Diagonal Screw Hole Center to Center Distance: 117 mm Outer Diameter: 152mm 4 inch: Frame Inner Diameter: 112 mm Diagonal Screw Hole Center to Center Distance: 92 mm Outer Diameter: 124mm 3 inch: Frame Inner Diameter: 87 mm Diagonal Screw Hole Center to Center Distance: 72 mm Outer Diameter: 94mm 2 inch: Frame Inner Diameter: 60 mm Diagonal Screw Hole Center to Center Distance: 46 mm Outer Diameter: 65 mm Color: Silver Material: ABS Plastic and Metal Note: To avoid ear discomfort, we suggest you NOT to turn the volume to the maximum. Just lower the level to a minimum and make sure you find the comfortable and good level. Note: 1. Please allow 1-3mm error due to manual measurement. Make sure you don't mind before bidding. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you. Package Includes: 2 x Speaker Decorative Circle