WonderPana 145 Essentials Kit - 145mm Filter Holder, Lens Cap & CPL Filter for Tokina 16-28mm f/2.8 at-X Pro FX Lens (35mm) Premium Grade Anodized Aluminum WonderPana145 Core Unit High Quality, Double Threaded, CPL Filter - Made of Optical Glass 145mm x 1mm Standard Thread Enabled Included Finely Crafted, Heavy Duty Inner Pinch Lens Cap 24-Month Manufacturer Warranty