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A kind of ball
2 views, from the comparison photos it’s in.
About
A tennis ball is a felt-covered hollow sphere measuring about 2.6 inches across, sized to fit comfortably in one hand.
Official regulations require the diameter to fall between 2.57 and 2.70 inches (6.54 to 6.86 cm). It is larger than a golf ball but noticeably smaller and lighter than a standard baseball. Even though it feels firm, it is completely hollow and relies on pressurized air inside to give it bounce.
From Wikipedia
A tennis ball is a small, hollow ball used in games of tennis and real tennis. Tennis balls are fluorescent yellow in professional competitions, but in recreational play other colors are also used.
Read more on Wikipedia →Text from Wikipedia’s “Tennis ball” article, CC BY-SA 4.0.
5 on the site
Weight
2.05 oz (58 g)
Quick answer
A standard tennis ball has a diameter of about 2.6 inches (6.7 cm) and weighs 2.0 ounces (58 g). That makes it roughly the size of a small apple.
Typical figures, the same ones every comparison on the site uses; real ones vary.
More like a tennis ball
Compare it
Next to anything: a person, a car, another ball.