The Rocket Halfbody (ロケットハーフボディ, Roketto Hāfubodi) is an abiotic B-Side Halfbody of Kamen Rider Build. Accessed through the Rocket Fullbottle, its Best Match is the Panda Halfbody. In any form that uses the Rocket Fullbottle, Build is armed with the Space Ride Arm (スペースライドアーム, Supēsu Raido Āmu) on his left arm that can combine with the BLD Rocket Shoulder (BLDロケットショルダー, BLD Roketto Shorudā) to form the Cosmo Builder (コスモビルダー, Kosumo Birudā) assault rocket/missile, which can fly off as a rocket a