WonderPana 145 ND Kit - 145mm Filter Holder, Lens Cap, ND16 & ND32 Filters for Tokina 16-28mm f/2.8 at-X Pro FX Lens Premium Grade Anodized Aluminum WonderPana145 Core Unit High Quality, Double Threaded, ND16 & ND32 Filter - Made of Optical Glass 145mm x 1mm Standard Thread Enabled Included Finely Crafted, Heavy Duty Inner Pinch Lens Cap 24-Month Manufacturer Warranty