What would be the downside of putting these strings on an old classical guitar I bought for $25. Would it cause the neck to bow?

Your guitar will be damaged on a classical with steel strings. Classical guitars necks are not built for steel they are built for nylon strings. Your neck will bow and warp

Are the first 3 strings nylon?

No, they are plain steel as in other acoustic sets. Nylon would only be found on classical sets.

What would be the best string size to use on a used acoustic guitar to be played by a 9 year old boy?

The lighter the guage...the easier to bend. The easier to bend...the harder to control. Since its an acoustic guitar, i would start with 10's ...try .10 to .46. Thats a pretty standard guage. He should be able to tell if he would like a smaller guage in which case go to 9's. Better yet....take him to a guitar shop and let him try some different guage strings. If hes just strumming, he may like the 10's. When hes ready for more sophisticated play, and until his hands get larger and stronger, he may need the 9's. Happy playing!

Can I put nylon strings on a guitar that use to have metal?

You can. You will need to do a neck adjustment to makeup for the lower tension. These strings are metal that the question was asked under.

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【正規品】 ERNIE BALL 2153 アコースティックギター弦 12弦 (09-46) EARTHWOOD 12-STRING PHOSPHOR BRONZE LIGHT

Product ID: 741477975

Details

ストリング材質タイプ
リン青銅
ブランド
Ernie Ball
弦のゲージ
カスタム
楽器
アコースティックギター
色
ライト(09-46)

🎸12-string rich resonance

🛡️phosphor bronze durability

🇺🇸Made in USA quality

¥4985

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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

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Description

🎶 Unlock your guitar’s full sonic spectrum with Earthwood brilliance!

PHOSPHOR BRONZE WRAP - High copper & tin blend ensures long-lasting brightness and corrosion resistance.
PRECISION LIGHT GAUGE SET - Custom 09-46 gauge for effortless playability without sacrificing depth.
VIBRANT 12 STRING CLARITY - Experience lush, transparent tones that elevate your acoustic performance.
FRESHNESS SEALED PACKAGING - Strings stay factory-new from day one, guaranteeing peak sound quality.
TRUSTED AMERICAN CRAFTSMANSHIP - Proudly manufactured in the USA for consistent premium reliability.

Ernie Ball Earthwood 12-string acoustic guitar strings (09-46 light gauge) feature phosphor bronze-wrapped hex core steel for warm, clear tones. Made in the USA and sealed fresh for lasting quality, these strings deliver professional-grade sound and durability favored by discerning musicians.

Specifications

ASIN	B0002DUPZA
Amazon 売れ筋ランキング	楽器・音響機器 - 894位 ( 楽器・音響機器の売れ筋ランキングを見る ) アコースティックギター弦 - 34位
GTIN (Global Trade Identification Number)	00749699121534
UPC	749699121534
おすすめ度	4.6 5つ星のうち4.6 (1,723) var
カラー	ライト(09-46)
ゲージ	カスタム
ブランド名	Ernie Ball
メーカー名	ERNIE BALL
メーカー型番	P02153
仕上げタイプ	コーティングなし
保証内容	最大1年※保証書の規定に基づく
商品の重量	0.1 ポンド
商品種別	アコースティックギター弦
型番	P02153
弦の材質	リン青銅
楽器	アコースティックギター

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¥4985

Duties & taxes included

In stock

Sold byAmazon JapanDelivered 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 Japan.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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