Schmidt's over the top version of bike light wiring for attaching a dyno-powered tail light to a dyno headlight. NOTE: Works as is with the B&M Luxos and Toplights we sell but Schmidt Edelux owners will need to replace the hub-end spades with the Schmidt size. It's coaxial so stronger and thicker than the cheap wire sets, but worth it if your bike takes a pounding or it's really nice and cheap wire would ruin the "look." We get the kind with pre-installed connectors on the end so it's easy to set up with the headlight and tail light we sell. Luxos + this wire set + the Dyno rack light and you're all set for Euro style commuting.