It's not on the balls alone, it's on the pitcher's gear. Glove. Hat. Etc. If you watch the clip halfway through the article, you can see a pitcher bent over lib

It's not on the balls alone, it's on the pitcher's gear. Glove. Hat. Etc. If you watch the clip halfway through the article, you can see a pitcher bent over liberally applying the bullfrog sunscreen to their arms to mix with the rosin.