The HonlPhoto Filter Kit: Autumn is a set of filters that attach to the front of your flash's lens, adding color to your photos. These filters attach to the HonlPhoto Speed Strap (sold separately) and can be used in tandem with other HonlPhoto flash accessories. The usable filter area is 2.5 x 4" (6.35 x 10.2cm) and can be trimmed with scissors to fit your individual strobe unit.