Premium HD Optical Glass: Crafted with high-definition glass and advanced multi-layer coating, this ND Filter Set for Hero 13 ensures crystal clear optics and superior lens protection, maintaining the and details in every shot. Ultra-Thin, No Vignette Design: The ultra-thin construction of these filters prevents vignetting, preserving the authenticity of colors and details in diverse environments, from landscapes and sports to everyday photography. Enhanced Control: The CPL filter in this set removes unwanted reflections and enhances contrast and color saturation for vivid, natural photos. The ND filters provide precise control over exposure, helping you capture the perfect shot in varying light conditions. Optimal Light Transmission: Featuring exceptionally high light transmittance, these filters minimal interference , maintaining clarity and enhancing color saturation and contrast by reducing glare and stray light. Specifications Hign-concerned Chemical:None Type:Action Camera Filters Compatible Action Camera :for Material: Aluminum alloy + glass Color: As shown (The product appearance and printed words depending on the batch, but this does not affect use) Package Contents: 4 x filters 1 x lens cleaning cloth 1 x Instructions in Chinese and English 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.