plastic back instead of glass for Samsung phones?

[luv2liv]

i have a Note9. the glass back always inexplicably cracks so i replace every 6 months myself. even though i have never dropped it, the back still cracks.
is there a back for it that's made of 100% plastic? seems i cant find anywhere. if i google, then i get a case which i do not want. i prefer my phone super slim without additional covers

 

[AlexanderSalazar]

I am sure that there are none plastic back replacements for not only your phone, but also others because it's not popular. I would recommend to buy a good phone case if you have so many problems with breaking your back glass, also you mentioned that your back crackes even if you don't drop the phone, be careful not to expose it to heat and also don't put it on trembling surfaces.