KEYINKEYIN Standard Black Single DVD Case - 10 Pack

Are these cases sturdier and thicker than the ones that DVDs come in in the stores?

If I try and twist the case, will it flex back and forth? Can the case support weight? Is it sturdier, like cases from ten years ago?

Does the center push button actually release the disc so it pops up, or you you have to practically force the disc out? TIA

Does “10 pieces” mean 10 cases included?