Custom game cases question

Hey all just wanted to ask a quick question. Started collecting over the last year and now that I have a handful of great games I wanna keep em protected. Found a fairly popular website, customgamecases.com.

They got great reviews and I've seen a number of happy people on Reddit with them. Just curious if these are worth investing in and, more importantly, will they damage or scratch the plastic on the cart? The games sit inside of some prongs inside the case and I just wanna make sure it won't hurt the shells.

Thanks in advance all!