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（ウイルソン）硬式テニスボールチャンピオンシップエクストラ・デューティー 1箱 12缶 36球入り I.T.F公認球

Product ID: 726869148

Details

ブランド
Wilson(ウイルソン)
商品の重量
0.02 キログラム
対象年齢
大人
材質
合成ゴム。
色
イエロー

🌍Trusted worldwide standard

🎾ITF-certified pro ball

📦36 balls per box, bulk ready

Description

🎾 Elevate your game and life’s moments with Wilson’s championship-grade tennis balls!

BULK SUPPLY - 36 premium Wilson balls per box—never run out during your game or life’s big moments.
CLEAN READY - Fresh sealed cans guarantee hygienic, ready-to-use balls—perfect for sport or support.
VERSATILE USE - Ideal for tennis pros, expectant parents easing labor pain, and even energetic pets.
TRUSTED BRAND LEGACY - Wilson’s global reputation ensures top-tier quality and reliability every time.
PRECISION PERFORMANCE - ITF-approved for consistent bounce and durability on all court surfaces.

Wilson Championship Extra Duty tennis balls are ITF-certified, crafted from durable synthetic rubber, and designed for all court types. Sold in bulk packs of 36 balls (12 cans of 3 balls each), they deliver consistent performance trusted worldwide. Beyond tennis, their perfect firmness and hygiene make them a surprising must-have for expectant parents and pet owners alike.

Specifications

ASIN	B001FZCVTM
Amazon 売れ筋ランキング	スポーツ＆アウトドア - 5,391位 ( スポーツ＆アウトドアの売れ筋ランキングを見る ) 硬式テニス用プレッシャーライズド・ボール - 9位
GTIN (Global Trade Identification Number)	00026388010011
UPC	026388010011
おすすめ度	4.2 5つ星のうち4.2 (7,176) var
お客様の年齢層	大人
カラー	イエロー
サイズ	1-Can
スポーツタイプ	テニス
チーム名	テニス
ブランド名	Wilson(ウイルソン)
メーカー名	Wilson(ウイルソン)
メーカー型番	FBA_WRT100101
ユニット数	1.0 缶
リーグ名	Tennis
付属コンポーネント	無し
保証内容	初期不良等あればご連絡お願いします。
品番・型番	WRT100101
商品の入り数	3
商品の重量	0.02 キログラム
商品種別	硬式テニスボール
構築タイプ	機械縫製
素材	合成ゴム。

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WILSON（ウイルソン） 硬式テニスボール チャンピオンシップ エクストラ・デューティー 1箱 12缶 36球入り I.T.F公認球

Details

Details

Description

Specifications

Common Questions

WILSON（ウイルソン）硬式テニスボールチャンピオンシップエクストラ・デューティー 1箱 12缶 36球入り I.T.F公認球