UHC Filter Size:Approx.28.5x0.6mm/1.12x0.02in. Type: High Contrast Filter (UHC Filter). Features: Substrates: precise polish substrates, good parallelism and surfaces precise. Double-sided fine polishing and polishing process ensures high parallelism Coating: double-sided multi-layer coating, the backside increases the penetration film and reduces the reflect light.
eBay