ELITE CREATIVE PRO X 2 ND Filter Kit – Blue Frog Filters
77mm Variable ND2-32 Filter with Cap, Adjustable Neutral Density ND Filter Kit - KENTFAITH
77mm +CPL+FLD+(2/4/8)Filter Kit Neutral Density Filter for DSLR E9U4 | eBay
Digital Pro SLR Filter Kit - 52DPSLRKIT – The Tiffen Company
Amazon.com : NiSi 77mm Swift True Color ND-Vario | 1-5 Stops Variable Neutral Density Filter | Adjustable ND, True-to-Life Color, No Vignetting, Optical Glass with Nano Coating | Photography and Videography : Electronics
77mm ND2-400 (9 Stops) Variable ND Filter Neutral Density Adjustable Filter for Canon Nikon DSLR Cameras - KENTFAITH