Designed for the Generations Red Alert mold, this head modification will fit any 5mm standard ball joint neck. Transform your spare Generations Red Alert into the Headmaster known as CHROMEDOME! The Chromehead upgrade is modeled based on the character's representation in the Takara's "The Headmasters" Transformers anime. The recommended material is Polished White Strong and Flexible, though the figure is detailed enough to warrant a Frosted Ultra Detail production. I would only recommend that choice to customizers that will be able to finely detail the paint apps. Be forewarned: Frosted Ultra Detail is extremely fragile on this model. Ball joints are known to break for no reason other than transforming back into robot mode. That's why I would recommend a more resistant material like WSF. You might need to sand the three posts on the back of Chromehead's face. They are slightly longer by design to allow the head to pop off and on to the ball joint, but the excess in height leaves a visible crease (only if you look at it sideways... and you can easily position the arms of the figure to hide those anyway, I'm just writing it out here so that I don't get crappy feedback about shoddy design). Sanding required to "tighten", though bear in mind that paint will also do the same. Painting / dyeing required. Check out G2P-005b for the chest "Tech Spec Meter" and G2P-005c for G1 Toy Inspired guns!