For use on b1 and b2 heads only the profoto off camera flash colour gel starter kit contains the ten most popular coloured gels together with the ocf grid gel holder and two snap on gel attachment pieces the gels are pre cut and pre labelled for fast and easy use and can be used in conjunction with any ocf light shaping tools to balance colour temperature or add creative effects supplied complete with bag and wallet for storage please note ocf gels may only be used with profoto off camera