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Optical-grade PMMA material ensures high light transmittance and low distortion for focused beam output. -convex devise effectively concentrates light, ideal for zoom flashlights, bike headlamps, and spotlights. Available in 16 diameters from 15mm to 50mm, compatible with most DIY lighting and replacement projects. Lightweight and impact-resistant acrylic construction offers durability without adding extra weight to your setup. Each package includes 1pc lens, ready for direct installation or optical system upgrade.