The product is a pair of authentic Tiffany & Co. TF4121 B brown gradient replacement lenses. These lenses are specifically designed for women and are crafted with gradient brown lens technology, perfect for adding a stylish touch to any pair of sunglasses. The authentic Tiffany & Co. brand ensures high quality and a perfect fit for your sunglasses, making these lenses a great choice for those looking to enhance their accessory collection.