The Lenskin 77mm ND 1000 filter frame is made of lightweight aluminum material and is quite acceptable considering the incredibly affordable price. Surprisingly there is almost no color cast and no loss of sharpness when using my Canon 17-40mm ultra wide angle lenses on the Canon 6D. See attached images, left image with ND1000 filter and right image without filter. This subtle filter doesn't add any extra vignetting to your ultra wide angle lenses, which is good. When tested with my cheap 18-55mm kit zoom lens, my Sony A6000 had a slight warm color cast with the up/down ring adapter, but not with the Rokinon 12mm lens. One of the cheapest ND filters.
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