Features: Brand-new and high quality ABS plastic and metal material Improve your listening- feeling effect,give you more sweet-sounding. The surface- is smooth,and comfortable in touching-. For your for health,please replace or clean it every three to six months. 2inch/3inch/4inch/5inch/6.5inch/8inch optional Specifications: Color: Black Material:ABS Plastic and Metal Size:approx 2inch/3inch/4inch/5inch/6.5inch/8inch 8 inch: Frame inner diameter:210mm Diagonal screw hole center to center distance:184mm Outside diameter:1221mm 6.5 inch: Frame inner diameter:171mm Diagonal screw hole center to center distance:145mm Outside diameter:184mm 5 inch: Frame inner diameter:142mm Diagonal screw hole center to center distance:117mm Outside diameter:152mm 4 inch: Frame inner diameter:112mm Diagonal screw hole center to center distance:92mm Outside diameter:124mm 3 inch: Frame inner diameter:87mm Diagonal screw hole center to center distance:72mm Outside diameter:94mm 2 inch: Frame inner diameter:60mm Diagonal screw hole center to center distance:46mm Outside diameter:65mm Note: To avoid any uncomfortable feeling to your ear,we suggest DO NOT turn the volume on full. Just turn the level in minimum and make sure you find the comfortable and good level. Please allow 1-3mm error due to manual measurement. Please make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you Package includes: 2PCS x Speaker Decorative Circle