Only opened. I purchased this but never used it. This is a C series filter, one step up from the K series, and is considered a mid-grade product. A 77mm CPL filter with high light transmission, featuring nano-coating and a slim frame. - Brand: K&F CONCEPT - Model Name: HMC CPL - Size: 77mm - Features: Nano-coating, Slim frame - Characteristics: High light transmission, Low reflection Thank you for looking.