1. Made of PC plastic material, much thinner than glass material, durable and scratch resistant. Black frosted lenses protect against dust, sand, bumps and splashes. 2. The lenses effectively filter strong light, harmful light and sweat light to prevent eye damage. 3. The glass is flat and is commonly used for welding helmets to reduce the strain on the welder's eyes caused by light and heat. 4. Suitable for most helmets with 2" x 4-1/4" window openings. Please make sure to choose the right size for installation. 5. The higher the colour number, the darker the colour of the glass and the stronger the light filtering. Choose the correct colour number according to your project before purchasing.
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