Looks like the helmet Barry Bonds wore when hitting his record-tying and record-breaking home runs (755 and 756 if you're counting) is being displayed at the National Baseball Museum and Hall of Fame. Exciting!
May we make a suggestion? Let people try it on.
What a wonderful educational, interactive exhibit that would be. Seeing personally how huge one's head would be after years of using steroids (allegedly! allegedly!) is probably a most persuasive argument to keep little sluggers off the "clear" than vague tales of ball shrinkage.