They look similar to the JC Whitney style pipes. Which are not bad pipes and are pretty loud too. But they are also pretty "cheap" pipes (hence the "Replica" name) and will not last as long as good quality pipes like Sceptre, SS, Epco, Tbike etc etc.
But for only $100 a set you can also buy new ones every couple years and still be ahead.
But as far as hurting you, don't think theyt will hurt anything other than your eardrums.

I like the replica part too, reminds me when I worked at Sony they had these little stickers thet read:
Genuine simulated woodgrain materials.