macbook power adapters are designed to work with 110 & 220Volts.
I have used my macbook pro power adapters in india and uae. when its plugged into 220V outlet, i felt this weird static on the macbook pro body. i have used it for over 40 days. it works fine and it still does. its always good to get a 220 to 110 converter, but you don't need it. the only NECESSARY thing you need is the adapter for the power plug (for the pins)