Rosco The Strobist Collection, Strobist 55 Piece Cinegel Filter Kit, 1.5x3.25" to fit most Shoe Mount Strobes. Strobe (shown in photo) NOT Included Filters may quickly be attached to strobe with rubber bands, tape, velcro or after-market gel holder (Not Included) Unlike the gel swatchbook, these gel filters fit better and do not have the hole punched in the filter. Multiple filters of the same color allow for matching multiple strobes. Rosco Cinegel range of color filters has earned two Academy Awards.