Those look like vinyl covered cement. They are not very durable, the vinyl will eventually crack and the concrete inside will powder out and make a mess. If you can find some solid steel ones with solid steel bars they will last almost forever. I still have the set I got 40 years ago and it is still the same as the day I got it! Whatever weigth you start with you can always get more plates later to increase the weight as you get stonger.
