Electric Hardknox - If Electric Knoxville shades come across too mellow, drive it to a harder edge with Electric's Hardknox Sunglasses! The style-all hard, all legend, all Electric-use handmade acetate with injected wire core frames. The scalloped arms latch on and stay put to let you rock on hard. Hardknox sunglasses are available in a variety of colors that aren't only hard-edged, but make that edge searing hot. Don't wait, the Hardknox style and Hardknox colors go fast.