Features: for 6/5/7 action camera. The Domes pushes the water lines away from the lens, the field of view is increased, above the water lines, it gives you very cool pictures. The water magnifies. This distorts the look of the photos, making the above water objects look normal while the underwater objects look larger. With the Domes port,normalizes the field of view, it above the water lines . The use of a semihemispherical Domes eliminates the perpendicular angle between the backing plate and the Domes.The benefits of this are the elimination of circular reflection and improved water sheeting while reducing the form factor and maintaining full front face surfaces area. Specifications: Materials: Acrylic, ABS Diameter: 16cm(6.30in)(approx) Quantity: 1set Package Includes: 1PC Domes Port 1PC Pistols Triggers 1PC Floating Hand Grip 1PC Long Screw 1PC Wrist Straps note: Please allow 0.5-1cm error due to manual measurement. please make sure you not mind before you bid. Due to the differences between different monitors, the picture may not reflect the actual color the item.