Balls...

being a roller hockey player, i can tell you there are a number of different weights/hardnesses of balls (and colours) so dont let that be an issue for you.

having never played Polo tho, a field hockey ball might be better (a lacross ball is slightly smaller, but simular weight, dunno if thats worth a try)

Yea, the red ones are the right ones. At least by Franklins standards, their red is for the warmer weather, orange for cold and yellow for freezing. Which ones do you use for roller hockey and where do you get them?

We currently use a field hockey ball majority of the time, it's just too big and heavy IMO.