**Product Specifications:**
**Brand:** HELEN KELLER
**Lens:** H831 sunglasses lens, providing true colors and high-definition visual experience with TAC technology.
**Frame:** Classic square frame design that is versatile and fashionable, featuring a stylish multi-sided shape to complement different face shapes and create a modern sense of fashion.
**Weight:** Lightweight at 8g for comfortable and barely noticeable wear.
**Flip Design:** 180° flexible flip design for convenient and safe use when entering tunnels or garages.
**Lens Attributes:**
- **Design:** Clip-on type with 180° flip design
- **Dimensions:** 50mm (lens width), 56mm (lens height), 14mm (bridge width), 126mm (temple length)
- **Model:** H831
- **Lens Material:** TAC
- **Frame Material:** Metal
- **Product Colors:** Multiple color options available
- HP831C1 (Gray lens)
- HP831C3 (Dark red lens)
- HP831C20 (Purple pink gradient lens)
