Thumper Bumpers (Twang)

Thumper Bumpers are objects from Twang. They are circular, with a red ring around the outside, a blue filling in the middle, and a big, white star in the middle of that. Lines can go through them, but when Black Ball touches them, he will ricochet off of them in the opposite direction.

Trivia

 * The Bumpers resemble the shield of the popular comic book hero, "Captain America".