1.CE/CB certified T8 double tube light fitting(M4 series) 2.full copper wire ballast, 0.45mm thick, powder coating Advantages of T8 Double Tube Light Fitting(M4 series)1) Novel and nice design2) Steel thickness of lamp body: 0.45mm3) Full copper-wire ballast included4) Anti-rust, powder coating lamp body5) Specifications: 1X20W, 2X20W, 1X40W, 2X40W6) CE and CB-approved