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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🎈 Balance your kid’s focus and fun with every bounce!

KID PERFECT SIZE - Designed specifically for children 42-51 inches tall, ensuring a perfect fit.
ACTIVE FOCUS BOOSTER - Transforms restless energy into laser-sharp concentration for kids aged 5-7.
COMPLETE SET INCLUDED - Comes with an easy air pump and secure metal ball holder for hassle-free setup.
MOBILITY MEETS SAFETY - Smooth-rolling, lockable caster wheels for flexible classroom or home use.
ERGONOMIC POSTURE SUPPORT - Promotes healthy spine alignment with a stable, adjustable backrest.

The Gaiam Kids Balance Ball Chair is a 38cm stability ball chair designed for children aged 5 to 7 (42-51 inches tall), supporting up to 175 lbs. Featuring an adjustable metal back support, lockable caster wheels, and an included air pump, it promotes active sitting to improve posture and concentration in home or classroom settings.

Model Number	05-62241
Color	グリーン
Size	Onesize
Material	金属
Sport Type	ヨガ
Batteries Included	No
Maximum Weight Recommendation	79.38 kg
Product Dimensions	86.36 x 45.72 x 53.34 cm; 3.44 kg
Use Object	ユニセックス(子供)

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満足保証付きブルー/グリーン

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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満足保証付き ブルー/グリーン

Details

Description

Specifications

Have a Question? See What Others Asked

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満足保証付きブルー/グリーン