Would this would be good for a 2nd grader with child size desks at school?

Yes. It is the right size for my (small, but long legged) 9 y.o. (Fourth grader)

I have four of these and one ball has a leak where can I get replacement balls?

They offer replacement balls on Amazon: https://www.amazon.com/gp/product/B073XZPZYC/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

Can the castor wheels be replaced with the roller blade style wheels that come on some desk chairs now? Is their attachment point the standard size?

I’m not sure what the standard size is but hopefully this helps

Would a 3 year old be able to sit on this chair comfortably?

My son is 47" and it's perfect for him...he's kindergarten. However, you need a very low desk. We have it paired with a lifetime adjustable plastic table on the lowest leg height. It's the rectangle portable table from Costco. I would say it is going to be too small for him in a couple years.

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Gaiam (ガイアム) 子供用バランスボールチェア - クラシックな子供用安定性ボールチェア、オルタナティブスクールクラスルームの柔軟なデスクシートアクティブな学生向け付きブルー/グリーン

Product ID: 738042252

Details

サイズ
Onesize
スタイル
クラシック
ブランド
Gaiam
商品の重量
7.59 ポンド
色
グリーン

🎈38cm kid-size ball

⚖️175 lbs max load

🛠️Adjustable back support

Description

🎯 Sit Smart, Learn Sharp — The Balance Chair Every Kid’s Classroom Needs!

KID CENTRIC DESIGN - Sized precisely for 42-51 inch children, supporting up to 175 lbs with style and durability.
ERGONOMIC STABILITY - Promotes healthy posture with a secure metal ball holder and adjustable backrest.
ACTIVE FOCUS BOOSTER - Transforms restless energy into laser-sharp concentration for kids aged 5-7.
MOBILITY MEETS SAFETY - Smooth-rolling caster wheels with dual locks for flexible yet secure classroom seating.
PERFECT FIT INFLATION - Optimized air pump and inflation method ensure ideal bounce and comfort every time.

The Gaiam Kids Balance Ball Chair is a 38cm ergonomic seating solution designed for children aged 5-7 (42-51 inches tall), supporting up to 175 lbs. Featuring an adjustable back support, secure metal ball holder, and lockable caster wheels, it encourages active sitting to improve focus and posture in home or classroom settings. Includes an air pump and detailed inflation instructions for optimal comfort and performance.

Specifications

ASIN	B01DY5J792
GTIN (Global Trade Identification Number)	00018713622419
UPC	018713622419
おすすめ度	4.2 5つ星のうち4.2 (472) var
アイテムの深さ	21 inches
カラー	グリーン
ケース形	長方形
サイズ	Onesize
スタイル名	クラシック
ブランド名	Gaiam
メーカー名	Gaiam
メーカー型番	05-62241
ユニット数	1.0 個
付属品	Gaiam キッズバランスボールチェア
商品の入り数	1
商品の重量	7.59 ポンド
商品本体サイズ	86.4 x 45.7 x 53.3 cm
型番	05-62241
拡張可能である	いいえ
特殊機能	サイドポケット, ロック
素材	金属
組み立て式ですか？	はい
食器乾燥機対応	乾拭き

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How is product pricing calculated?+

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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TrustScore 4.5 | 7,300+ reviews

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Gaiam (ガイアム) 子供用バランスボールチェア - クラシックな子供用安定性ボールチェア、オルタナティブスクールクラスルームの柔軟なデスクシート アクティブな学生向け 付き ブルー/グリーン

Details

Details

Description

Specifications

Common Questions

Gaiam (ガイアム) 子供用バランスボールチェア - クラシックな子供用安定性ボールチェア、オルタナティブスクールクラスルームの柔軟なデスクシートアクティブな学生向け付きブルー/グリーン