1. Aviation Aluminum Alloy Frame, Cnc Precision Processing, Coloring Process 2. Are Adjustable Filters. You Can Rotate The Golden Lens Ring As Needed When To Achieve Satisfactory Polarization Requirements. 3. Just Approach It Gently And It Will Be Firmly Absorbed. 4. Excellent Lens Grinding Process, Good Physical And Chemical Properties, Make The Image Clearer And Make Your Work More Professional 5. Waterproof, Oil-Proof And Scratch-Proof, Effectively Protecting Lenses Product Name:For Filter Series Applicable Models:For POCKET 3 Note:Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Will Not Affect The Use Type:D:+ND8+ND16 Filter Colour:As Shown Material:Aluminum + optical glass lens Size:About 23x18mm Package Contents: 1 * Filter 1 * ND8 Filter 1 * ND16 Filter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.