Sanko Optical Slendy SD-030 C-4 New, Unused, Made in Sabae Frame The biggest feature of this frame is "GUMMETAL," a new titanium alloy developed by the Toyota Central R&D Labs, a think tank of the Toyota Group. It is reportedly used in car suspensions. It is flexible like rubber, highly strong, and also has good resilience. It is far more resistant to rust than general titanium alloys, and is also extremely gentle to the human body. It is a metal (titanium alloy) that is like rubber. Moreover, it is lightweight, making it very comfortable to wear. 《Size》48□15-133 　　　　　Lens vertical width 25mm 　　　　　Frame horizontal width 128mm 《Color》Black ※This cannot be used as is. Please have your prescription lenses fitted at a nearby eyeglasses store, or we can also fit prescription lenses for you. In that case, it will take 4-7 days to ship, and the fee is an additional ¥3300~ (for both eyes). Please see the profile for details and comment in the comment section.