The ProYo Cold Fusion Isotope-2 by Playmaxx is a yo-yo released as part of a series of slimline Butterfly-shaped yo-yos produced before Playmaxx's acquisition by Duncan Toys. It is a heavier variant of the Isotope-1 yo-yo, with thicker and more rounded rims, along with a revised string gap and an antique-style brass finish. Less than 150 of these yo-yos were produced, and was one of the very last models made before the Duncan acquisition. The yo-yo also comes included with extra Brake Pads and strings, and a holster clip.
Also released was a limited edition model, the Isotope D2O, which featured a bronze anodized finish and the same set of goodies as the standard Isotope-2.