The Spike-Fly is a custom, made-to-order yo-yo produced by Dif-e-Yo. It is a variation of the Dif-Fly with an extended axle section, in order to accommodate YoYoJam spin top bearing tips on the sides. The bearing tips can be pressed in or pulled out, giving players the option of whether or not to use them. Also released was an all-aluminum variant, the Gladiator, which has spikes machined into the sides of the body.