Features: 【Aluminum alloy and acrylic 】: Crafted from Aluminum alloy + acrylic ensuring clear and durability, effectively reducing scratches and damage while guaranteeing high light transmission. 【Waterproof Design】: Specifically engineered for underwater photography, featuring robust waterproof performances for use in aquatic conditions without compromising image quality. 【Lightweight Construction】: Crafted from lightweighted, these filters minimise camera burden while maintaining portability for active photography scenarios. 【Effortless Installation】: Featuring a simple clip-on design, filters can be quick swapped to enhances efficiency. 【Scratch-Resistant Coating】: With anti-scratch coating for added protections, extending the filters service life. Specifications: Component Aluminum alloy + acrylic Size: about 32.4x6.9mm/1.27x0.27in Applicable Products: for Action 4 Color： optional Package Includes: 1PC Waterproof filter note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.