This clip is designed to snap on CD's or DVD's and fit into the head of bike's spokes. The flat part at hte end can be used to place powerLEDs if you want to use that light source, or to glue to a different support.Print as many clips as the CDs you're going to use. To do the design we did, unscrew all the spokes from a bike wheel, snap each single spoke to a CD clip, putting it close to the the head (flat and bent part usually attached to the hub)into the cut on the side of the body and rotating it 90° until it snap on it. place the CDS on the clips and fix the spokes to the central structure (we used the hub itself bending the end of the spokes).