Elimavi 927 100W 5.25 Inch Way In Ceiling Home Theater Stereo Sound Speaker System, White,In terms of materials, always insists on using better ABS material+ paint, which is made of high temperature resistance, low temperature resistance, high impact resistance, flame retardant,and electrical insulation,environmental protection and non-toxic,frequency response: 90HZ-20Khz, sensitivity:89dB, line voltage: 70-100V, cut out size:6.5inchs(165mm)