Just made my pvc rings ( the guide i used http://www.instructables.com/id/How-to-make-PVC-gymnastic-fitness-rings/ ). They are stronger than i expected and it doesnt seem possible to break. I;m going to use them for some rows and i feel quite safe using them. Also xr support is a lot harder than i expected! They costed around 20E total, straps being the most expensive ( about 80% of the total cost ). Anyway I highy recommend building your own set if you live outside of USA and buying a good set of rings costs around 80-100 dollars. P.S If anyone needs help or tips feel free to ask