how long lifespan of 1 ball ?is it destroying over time?

Yes, a Kenko soft tennis ball does have a limited lifespan. The ball must be properly inflated so that when it is freely dropped from 150 cm high the first bounce should be 75 cm +/- 5 cm. How long is the lifespan? I don't have any good answer but I can share our experience with you. We have a group of seniors who play doubles using two balls for about two hours in a session. The balls usually last for 6-8 sessions. The rubber balls are subject to wear and tear. The harder you hit in rallying, serving, or overhead the shorter the lifespan will be. FYI: In 2013 we uploaded four short videos on YouTube named "Alhambra Park (near Pasadena, CA) Soft Tennis."

What i s the diameter of t he ball?

The diameter of a soft tennis ball is between 6.5cm and 6.7cm. For more information on playing soft tennis, please visit the website of the International Soft Tennis Federation.

Brand	Markwort
Material	Rubber
Colour	Yellow
Age Range (Description)	Big Kid
Item Weight	177 g
Sport	Tennis
Number of Items	4
Team Name	tennis
League	tennis
Construction Type	hollow rubber ball inflated with air
Global Trade Identification Number	00016562890232
UPC	016562890232
Net Quantity	1 Count
Batteries Included	No
Included Components	3 Rubber tennis balls, Pump
Length	5.9 Inches
Width	5.4 Inches
Height	4.5 Inches
Weight	0.2 Pounds
Material Type	Rubber
Outer Material	rubber
Skill level	Beginner
Manufacturer	Kenko
Country of Origin	USA

Markwort Rubber Kenko Soft Tennis Ball Starter Set (Yellow) - 4-Piece

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