HJC RPHA 1 Joker DC Comics MC-48SF HelmetHJC RPHA 1 The RPHA 1 was designed and developed after several years of focused efforts and crucial feedback from top world class athletes in MotoGP. HJCs top engineers went to work and created a race bred helmet that is truly worthy of top race circuits around the world. The RPHA 1 is the very same model used by HJCs world class athletes in both MotoGP and WorldSBK, and HJC is set to finally launch it into full production with FIM homologation