The Dif-Fly by Dif-e-Yo was the first player yo-yo that Frank Difeo released on the market. The Dif-Fly, based on the earlier Daizzy-Fly, featured a slimline, flat-rimmed shape and removable rubber weight rings on the sides. When the Dif-Fly was first released, it was sold with the grooved bearing, which was previously featured in the earlier Daizzy-Yo and Daizzy-Fly yo-yos. In the later release of the yo-yo, Frank began implementing his revolutionary KonKave bearing with it. Originally, the Dif-Fly used the older Friction Disc response system, but later on, the Dif-Fly is fitted with Dif Pads. The current version of the Dif-Fly has its Dif Pads flush mounted and is thus designated as the Dif-Fly-F.