For use exclusively with the MagGel Holder, the Advanced Gel Kit was put together by MagMod to assist photographers in converting their speedlight's daylight color balance to tungsten, or to warm or cool its quality of light. The kit contains eight rigid polycarbonate gels that slip into the MagGel's integrated slot. The set includes two Full CTO, three 1/2 CTO, and two 1/4 CTO filters, as well as a Full Blue filter. The gels require separate purchase of a MagGrip for use.