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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Championship Tennis Balls

Product ID: 2152588

Details

Age Range (Description)
Kid
Brand
Wilson
Color
Green
Item Weight
145 g
Material
Rubber

🎾Official ball of US & Australian Open

🏆USTA & ITF approved for pro-level play

🧵Exclusive Dura-Weave felt for durability

$32

Duties & taxes included

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Description

🎾 Elevate your game with the ball that champions trust!

PRO LEVEL APPROVAL - USTA & ITF certified for competitive matches
RESEALABLE CAN PACKAGING - Keeps balls fresh and ready for every game
DURA WEAVE FELT TECHNOLOGY - Engineered for longer-lasting play and superior feel
VERSATILE COURT COMPATIBILITY - Perfect for clay, indoor, and hard courts
GRAND SLAM CERTIFIED PERFORMANCE - Trusted by pros at US Open & Australian Open

Wilson Championship Tennis Balls are the official balls of the US Open and Australian Open, featuring exclusive Dura-Weave felt for enhanced durability and performance. Ideal for clay and indoor courts, these USTA and ITF approved balls come in a resealable can to maintain freshness, making them the top choice for high school, recreational, and competitive players alike.

Specifications

ASIN	B00005BWVR
Age Range (Description)	Kid
Age Range Description	Kid
Ball Type	Tennis Ball
Best Sellers Rank	#26 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #1 in Tennis Balls
Brand	Wilson
Brand Name	Wilson
Color	Green
Construction Type	Woven
Customer Reviews	4.8 out of 5 stars 2,346 Reviews
Global Trade Identification Number	00026388010035
Included Components	Wilson Championship Regular Duty Tennis Balls - 3 Ball Can
Item Diameter	6.54 centimeters
Item Type Name	Wilson Championship Regular Duty Tennis Balls - 3 Ball Can
Item Weight	145 g
Manufacturer	Wilson Sporting Goods - Team
Manufacturer Part Number	WRT100300
Material	Double-Knit-fabric
Material Type	Double-Knit-fabric
Model Number	WRT100300
Number of Items	3
Number of Packs	1
Size	Single Can (3 Balls)
Sport	Tennis
Sport Type	Tennis
Tennis Ball Duty Rating	Regular Duty
UPC	600682786843 026388010035 782560434890
Unit Count	1 Count
Warranty Description	As Labelled

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$32