Features: 1. Product includes the thin optics reading glasses and a handy keychain case to keep the flexible glasses safe and attached to you wherever you go 2. Optical-grade polycarbonate lenses (used for high-end glasses) are shatter-proof, lighter than a nickel, and as thin as 2 credit cards 3. Ultra-flexible, titanium alloy (nitinol) bridge is 10x more elastic than steel springs and guaranteed to never break 4. Synergizes titanium alloy's flexibility with independent-suspension nose pads, delivering a universally comfortable yet stable grip on any nose, up high or down low 5. Lens material: PC Specifications: Keychain size: 73*40*10 mm(length * width * height) Glasses size: 105*25*20 mm (glass length * mirror width * nose bridge spacing) Glasses weight: 5G Keychain weight: 22G