"Folding Disk with Turbo Dueling Compatability"

Errr. The HYBRID disk has the ability to merge with Duel Runners, the folding disk is just a lightweight version for easy movement but trickier card playing. Basically, if you take the hybrid one you can take virtually any Duel Runner to ride, but if you take a different one you'd need one wth a built-in disk or get your hands on a hybrid one later, somehow.