POLICE sunglasses with a silver frame and gradient lenses, a stylish square design. - Brand: POLICE - Lens Color: Gradient Purple - Case: With case - Frame Color: Silver - Style: Square Thank you for viewing. The hinges have a spring mechanism that opens outwards, providing a good fit and preventing them from opening unintentionally. I bought these because I have poor eyesight and wanted to wear them when using contacts, but I rarely had the opportunity, so I hardly used them. I've worn them about 3 times.