Wobbly rims? Can I still use them?

Hey I just bought some used rims today, and they seemed alright until I got home and noticed a VERY slight wobble when a few was rolled on the carpet. Theres no tire on it. Theres no visible dammage, and you can't feel where the damage is either, except for one. You can feel a VERY slight curve on one I think, but it might just be me thinking I feel a curve. Can I still use them without getting them repaired? Will the weight things fix this problem if I get it rebalanced? btw its an 18" rim, and I haven't used them yet.