Kamen Rider Heisei Series 01 Keychain (Set of 10) (2 hidden characteres)Kamen Rider Heisei Series 01 Keychain (Set of 10) (2 hidden characteres) Code_threezero, threezeros brand specializing in trendy clothing and IP collectibles, is collaborating for the first time with the enduring Japanese Tokusatsu series Kamen Rider to release a series of keychain blind boxes featuring chibi style Kamen Rider characters. In the first wave of Kamen Rider (Heisei Series 01) Keychain Blindbox, 10 first Riders from the Heisei era will