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.

Where can I buy soft-tennis rackets in US?

Dear buyer. We have the set of raquets that comes with a couple of balls pluss the inflator

Deliver to Morocco

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

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

Product ID: 350536295

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Details

Brand
Markwort
Material
Rubber
Colour
Yellow
Age Range (Description)
Big Kid
Item Weight
177 g

🎾Standard size, pro feel

💨Air-inflated for perfect bounce

🧴Includes pump for on-the-go inflation

Description

🎾 Elevate your game with the perfect beginner’s bounce!

LIGHTWEIGHT PORTABLE - Easy to carry and perfect for practice anywhere
VIBRANT YELLOW VISIBILITY - Stay sharp on the court with high-visibility balls
AIR INFLATED HOLLOW DESIGN - Optimized bounce and control for skill-building sessions
PRO SIZED SOFT RUBBER BALLS - Experience authentic tennis play with beginner-friendly softness
COMPLETE 4 PIECE STARTER SET - Everything you need to start practicing immediately

The Markwort Rubber Kenko Soft Tennis Ball Starter Set includes four standard-sized, air-inflated hollow rubber balls designed for beginner tennis players. Featuring a vibrant yellow color for enhanced visibility and a pump for easy inflation, this lightweight set is ideal for practicing serves and returns, making it the perfect entry-level tennis training kit.

Specifications

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
Recommended Uses For Product	Playing tennis, Practicing tennis serves and returns
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