Fotodiox Pro Softbox 24x36" with Speedring for Novatron M Series Monolight M150, M300, M500, Bare Tube Head 2107FC Strobe Pro grade, heat resistant reflective fabric Features inner baffle, and outer diffusive cover for even light throw Sealable venting for use with high power modeling lamp or continuous lighting Rotation speeding ring with thumb screw lock 24 Month Manufacture Warranty