This is a Photoflex Speed Ring compatible with Bowens Esprit 250 and 500, Prolite 82, 100 and 120, Travelite 250, 750, Travelite Voyager, and Impact VS160, VS300, VS-LCD400, VSD-400, and VC-500LR monolights. OctoDome connectors are made from heat resistant cast aluminum for durability. They allow full rotation of any shaped Photoflex (or other brand) softbox while it is mounted to your flash head.