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 Extra Duty Hard Tennis Ball, Box of 12 Cans, 36 Balls (I.T.F Approved Balls

Product ID: 726869148

Details

Age Range (Description)
Adult
Brand
WILSON
Color
yellow
Item Weight
0.02 Kilograms
Material
Synthetic

🎾I.T.F Approved Pro-Grade

📦Box of 12 Cans (36 Balls)

🛡️Extra Duty Durability

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Description

🎾 Elevate your game with the pro’s choice—don’t get left behind!

BULK READY - 36 balls in 12 cans—perfect for serious players and clubs who never want to run out.
BUILT TO LAST - Extra Duty felt designed to withstand intense play on all court surfaces without premature wear.
VERSATILE PLAY - Optimized for all court types, ensuring reliable bounce and control wherever you compete.
GLOBAL PRO STANDARD - Officially licensed by the International Tennis Federation for consistent, tournament-level performance.
TRUSTED WILSON QUALITY - Machine-sewn synthetic rubber construction delivers consistent feel and durability match after match.

Wilson Championship Extra Duty Hard Tennis Balls come in a bulk pack of 36 balls (12 cans), officially ITF-approved for tournament play. Engineered with durable extra duty felt and machine-sewn synthetic rubber, these balls offer consistent bounce and long-lasting performance on all court surfaces, making them ideal for both serious practice and competitive matches.

Specifications

ASIN	B001FZCVTM
Age Range Description	Adult
Amazon Bestseller	#1,765 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #5 in Pressurized Extra-Duty Tennis Balls
Brand Name	WILSON
Color	yellow
Construction Type	Machine sewn
Country of Publication	Thailand
Customer Reviews	4.2 4.2 out of 5 stars (6,701)
Global Trade Identification Number	00026388010011
Included Components	No
Item Type Name	Hard Tennis Balls
Item Weight	0.02 Kilograms
League Name	Tennis
Manufacturer	Wilson(ウイルソン)
Manufacturer Part Number	FBA_WRT100101
Material Type	Synthetic Rubber
Model Number	WRT100101
Number of Items	3
Size	1-Can
Sport Type	Tennis
Team Name	Tennis
UPC	026388010011
Unit Count	1.0 Can
Warranty Description	If there are initial defects please contact us

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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4094901₫

Duties & taxes included

In stock

Sold byAmazon VietnamDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Vietnam.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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