LB: 9742752
This is in notables and one of the comments says to use a felt tip pen. These types of pens may "bleed" on paper, going outside the place you mark. It's not a good idea to use anything that may spoil a ballot or by going outside the mark area too much, give an excuse to have someone re-mark the ballot.
Ball point pen, be careful how you mark and fill in the area.
I know of no place I have voted that provides felt type pens. For one, they're kind of expensive vs a ball point and polls aren't likely to be swimming in money to buy them. And they can get messy.
Bring your own, nice, black ink ball point pen.