1. TPU + PC material is non-toxic and tasteless wear-resistance and anti-ageing.2. Electroplated alloy frame provides protection for the lens.3. Detachable metal buttons comforable touch and sensitive response.4. Four-corner airbags cover for good shock-absorbing.5. With good performance and quality it may work for a long time.Note: The actual product is subject to the title model the model of the picture is for reference only.