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 Kilograms
Material
Rubber

🎾USTA & ITF Approved

🏆Official Ball of Grand Slams

🛡️Dura-Weave Felt Durability

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MOP$70

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Description

🎾 Elevate your game with the ball that champions trust!

RESEALABLE CAN - Keeps your balls fresh and ready, so you never miss a perfect bounce.
GRAND SLAM OFFICIAL - Used at the US Open and Australian Open, the same ball trusted by top pros worldwide.
UNMATCHED DURABILITY - Exclusive Dura-Weave felt designed for extra duty on hard courts, lasting longer through intense matches.
VERSATILE PERFORMANCE - Ideal for all court surfaces and player levels, from recreational rallies to competitive tournaments.
PRO LEVEL CERTIFICATION - USTA and ITF approved for tournament-grade play, ensuring you compete with the best.

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 consistent performance on hard courts. USTA and ITF certified, these extra duty balls come in a resealable can, making them perfect for players seeking tournament-quality play and long-lasting reliability.

Specifications

ASIN	B001FZCVTM
Age Range (Description)	Adult
Age Range Description	Adult
Ball Type	tennis ball
Best Sellers Rank	#65 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #1 in Tennis Balls
Brand	WILSON
Brand Name	WILSON
Color	Yellow
Construction Type	Woven
Customer Reviews	4.8 out of 5 stars 14,185 Reviews
Global Trade Identification Number	00026388010011
Item Diameter	6.54 Centimeters
Item Weight	0.02 Kilograms
League Name	Tennis
Manufacturer	Wilson
Manufacturer Part Number	FBA_WRT100101
Material	Rubber
Material Type	Rubber
Model Number	WRT100101
Number of Items	1
Number of Packs	1
Size	Single Can (3 Balls)
Sport	Tennis
Sport Type	Tennis
Stitching Type	Woven
Team Name	tennis
Tennis Ball Duty Rating	Extra Duty
UPC	026388010011
Unit Count	3.0 Count

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