I'm playing in Quito. Elevation 9300ft. Has anyone played them at an altitude like that?

Yes- in breckenridge CO- elevation quite high as well. The balls fly higher you go. Not the same as playing at sea level, for certain.

What number are they? 1, 2, 3 or 4?

I use them by the hundreds for tennis coaching. I never paid much attention to the numbers, but I opened 4 today and each had 1 can of each number.

Which is firmer, heavy duty or extra duty? I need these to put on my back and keep me from sleeping on it.

My cattle dog loves tennis balls! We have to buy the extra duty or he cracks them quickly. Hope this helps!

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WILSON Championship Tennis Balls

Product ID: 1052082

Details

Age Range (Description)
Adult
Brand
WILSON
Color
Yellow
Item Weight
0.02 kg
Material
Rubber

⏳Extra Duty for Longer Play

🎾USTA & ITF Approved

🛡️Exclusive Dura-Weave Felt

€ 14.25

Duties & taxes included

In stock

Sold byAmazon CyprusDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎾 Elevate your game with the ball that wins majors and hearts.

EXTENDED PLAYTIME - Extra Duty rating designed for hard courts keeps your game going longer.
PRO LEVEL APPROVAL - Official ball of US Open, Australian Open & NCAA Tennis—trusted by champions.
PERFECT FOR EVERY PLAYER - Ideal for all skill levels, from competitive tournaments to weekend matches.
TOURNAMENT READY QUALITY - Used in 45+ professional tournaments worldwide—play like the pros.
DURABILITY MEETS PERFORMANCE - Exclusive Dura-Weave felt ensures unmatched longevity and consistent bounce.

Wilson Championship Tennis Balls are the official balls of major Grand Slam tournaments and NCAA Tennis, featuring exclusive Dura-Weave felt for superior durability and performance. Designed for extra duty on hard courts, these balls deliver consistent bounce and long-lasting play, making them the top choice for professionals and enthusiasts alike.

Specifications

ASIN	B001FZCVTM
Age Range Description	Adult
Ball Type	tennis ball
Best Sellers Rank	#25 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #1 in Tennis Balls
Brand Name	WILSON
Color	Yellow
Construction Type	Woven
Customer Reviews	4.8 4.8 out of 5 stars (14,753)
Global Trade Identification Number	00026388010011
Item Diameter	6.54 centimeters
Item Weight	0.02 kg
League Name	Tennis
Manufacturer	Wilson
Manufacturer Part Number	FBA_WRT100101
Material Type	Rubber
Model Number	WRT100101
Number of Items	1
Number of Packs	1
Size	Single Can (3 Balls)
Sport Type	Tennis
Stitching Type	Woven
Team Name	tennis
Tennis Ball Duty Rating	Extra Duty
UPC	026388010011
Unit Count	3 Count

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