The Isotope II was a short-run limited edition Cold Fusion put on a weight loss program.  The R&D division of Playmaxx was looking at building a lighter and possibly faster-spinning Aluminum yoyo and they knocked it out of the park with the Isotope.  Two versions (Isotope I and Isotope II) were made with extreme minor modifications done, mainly to the coating and laser engraving.  Today, this yoyo is very elusive and rarely ever comes up for sale due to the low numbers that were made.  A prized collectible if you can get your hands on one!
 
•  Rare meter  • • • • • 5/5
•  Condition meter  • • • • • 5/5
•  Estimated Value $800 +
 
*Museum only piece.  This item resides in the personal collection*