Plastic (polyester) balls are all essentially the same. Just pick a color or design you like.
I wouldn't drill the holes if you're using it on a ramp. Since its speed is limited, the holes could change the angle of ball and also slow it down further if it should roll over them.
Is this league sanctioned? I can't remember what the rules state. You should ask the league secretary to look it up in the rule
book to see if it is legal to use it without holes. I think I remember an exception for the handicapped.
Good luck and have fun!
