Dif-e-Yo Dif-Fly

From YoYo Wiki

The Dif-Fly by Dif-e-Yo was one of the first yo-yo's that Frank Difeo brought to market. Initially sold for $58. The Dif-Fly featured a modified shape and rubber weight rings. Initially, Dif-Flies were sold with a novel "grooved bearing" which allowed the string to stay centered. Later, Frank began using a Konkave bearing with the Dif-Fly.

The Dif-Fly quickly stole the spot light from the Cold Fusion and the SB2 as the best modified shaped aluminum bearing yo-yo. Around the same time though, YoYoJam began make wide butterfly yo-yos with weight rings. These proved to be more popular, and naturally, Frank's designs changed to accommodate popular demand.