PGYTECH 3 PCS ND4+ND8+ND16 Drone Lens Filter for DJI FPV 1. Main material: aluminum, optical glass 2. Light weight, will not increase body load 3. SCHOTT optical glass is high-definition grinding, bringing clear imaging and restoring the subjective viewing angle experience. 4. The double-sided multilayer nano-coating gives the lens high-quality waterproof, oil-proof, anti-fouling and scratch-proof performance. 5. The use of coating light reduction technology avoids the color cast of traditional ND mirrors, and there is almost no color cast. 6. Quick disassembly and assembly design. The contact surface of the lens frame is made of flexible silicone material without damaging the original lens when installed. 7. The frame is made of aerospace-grade aluminum material, which is light and strong. High-precision adaptation and lossless flight performance. 8. Net weight: 2.9gx3