Check the listing for details. 6Pcs Diameter 18mm Flat Convex Lens, Height 6.5mm Acrylic Optical Lens. Condition: New. Listed at 10.51 USD. Optical convex lenses are widely used in LED lighting products like car lights, bike headlights, focus flashlights, spotlights, stage lights, projection lamps, downlights, condenser lens, optical devices, floodlights, and other lighting accessories. They work well with various high-power LEDs, including 1W, 3W, 5W, 8W, 10W, 15W, 20W, and 50-500W models, making them versatile for different illumination needs.Specification:Material: PMMA Acrylic;Color: Transparent;Style: Flat Convex Lens with Edge;Lens Diameter: 18 x 18mm / 0.71 x 0.71 inch(ODxID);Lens Height: 6.5mm / 0.26 inch;Edge Thickness: 2.5mm / 0.1 inch;Packing List: 6 x Flat Convex LensAdvantageThis optical lens is made of PMMA acrylic, which resists high temperatures, shatters less easily, and doesn’t age quickly, with high light transmittance.