Bloc Eyewear Billy Gun Shiny Tortoise Sunglasses (SG12 Grey Grad/ Cat 3 Lens) Description: A unisex shape with immense appeal. The Billy is a very simple but elegant frame combining KARBON TX temples & a stainless steel frame making it a very light & comfortable frame to wear. Conforms to EU Standard BS EN 1836: 2005 + A1:2007 Lens: BG12 Brown Graduated Cat.3 Karbon 8 Optical Class One lens provide MAX UV protection. Distortion free & virtually indestructible. Frame BLOC frames are hand finished flexible lightweight & designed for comfort fit & performance. The optical class hinges offer both quality & durability. The fully adjustable hypoallergenic nose pads are designed for comfort & fit.