This is a CMC MC filter, 49mm. Size: 49mm diameter I purchased this filter new at the same time as the lens. The lens it was attached to was used infrequently, and overall the filter is in good condition with no scratches or dirt. Please consider purchasing with the understanding of the above condition. Regarding purchase: Please make your decision based on the photos and the above description. In some cases, there may be omissions in the photos or insufficient explanations of the product. Please refrain from purchasing if you are looking for perfection or are concerned about the details. Returns are not accepted, so please make your decision carefully. Thank you.