ThinOpticsUniversal Pod Case and Readers Rectangular Reading Glasses

Are these glasses scratch proof? If not how easily do they scratch? My readers scratch quickly as I wear them in my front jeans pocket, will these?

What are the dimensions of the case? Surely it is not 6 x 3.8! It looks more like 4 x 2!

do you have in 3.0? I don't see it when I'm checking out.

Would the universal case fit on the back of the Samsung Galaxy S4?