Hardball
The short version
The 60×30 ball: rubber-and-yarn windings in a goatskin or similar hide cover.
Related
Ref questions
Eye protection (proper eyewear) is:
Answer: Required
Approved eyewear is mandatory.
A player is not properly wearing eyeguards during a rally (first offense).
Answer: Technical (stop play)
Missing eyewear in play is a technical; a second is more severe.
Gloves are:
Answer: Required (must be worn)
Players must wear gloves; they must be light/dry and unaltered.