For use on b1 and b2 heads only a set of twenty pre cut and labelled colour correction gels for use with the profoto b1 and b2 off camera flash contains the following 3 x full cto 3 x half cto 3 x quarter cto 2 x eighth cto 1 x half ctb 1 x quarter ctb 1 x eighth ctb 2 x plus green 2 x half plus green 2 x quarter plus green