Product Selling Points: 1. Multi-layer Nano-Crystal Coating 2. Lightweight Aluminum Frame 3. High-Definition Optical Glass 4. Adjustable CPL Filter 5. Lightweight Design for Portability Other Parameters: Main Material: Aluminum Alloy (Frame) + Optical Glass Net Weight: Single CPL: 3.8g, Single UV: 4.1g, Single ND16: 4g, Three-Piece Set: 12g (ND8, ND16, ND32) Gross Weight: Single CPL: 25g, Single UV: 25.4g, Single ND16: 25g, three-piece set: 62g (ND8, ND16, ND32) Product Dimensions: 2.7*2.7*0.5cm (UV) 2.7*2.7*0.5cm (CPL) 2.7*2.7*0.5cm (ND) Packaging Dimensions: Single: 6.3*1.8*6.3cm, Three-piece set: 8*2*9.6cm Packing List: GU007_1: UV filter*1, cleaning cloth*1, storage box*1 GU007_2: CPL filter*1, cleaning cloth*1, storage box*1 GU007_3: ND8, ND16, ND32, cleaning cloth*1, storage box*1 GU007_4: ND16*1, cleaning cloth*1, storage box*1 Packaging: Boxed