2 PCS 55W HID REPLACEMENT SLIM BALLAST For H1 H3 H4 H7 H10 H11 9005 9006 D2R D2S All Sizes 55W HID REPLACEMENT SLIM BALLAST For H1 H3 H4 H7 H10 H11 9005 9006 D2R D2S All Sizes 100% waterproof and 100% dustproof. Resistance to heat and aging, as well as vibration tested. The ballast has perfect performance on over-voltage,low-voltage, no-load and anti-access protections