breathing

I've tried nasal strips and they seems to really help me not get breathless when I'm playing singles. I'm curious if anyone has identified the brand that ruud and alcaraz are using (pink and black strip). There seems to some conjecture it's Breathe Right but I'm sure its not because a) they are...

Hello, is anyone aware if tennis ball fuzz is dangerous to breath, and if tennis balls are dangerous for toddlers while playing and placing them in their mouth? Thank you