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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Ernie Ball Earthwood Rock and Blues w/Plain G Phosphor Bronze Acoustic Guitar Strings - 10-52 Gauge

Ernie Ball Earthwood Rock and Blues w/Plain G Phosphor Bronze Acoustic Guitar Strings - 10-52 Gauge

Product ID: 286096660

Details

Brand
Ernie Ball
Colour
Rock & Blues
Instrument
Acoustic
String gauge
Light
String material type
Bronze

🎸10-52 gauge for versatile play

🛡️Element Shield packaging for freshness

🇺🇸Crafted in USA with premium materials

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MX$701

Duties & taxes included

In stock

Sold byAmazon MexicoDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎶 Elevate your acoustic vibe with strings that sing and sustain!

TRUSTED BY PROS - 4.7-star rating from 34,000+ musicians
HEX SHAPED STEEL CORE - Durable, stable tuning with vibrant resonance
PHOSPHOR BRONZE RICHNESS - Warm, clear tone with excellent projection
LEAD READY PLAIN G STRING - Optimal for expressive acoustic solos
FRESHNESS SEALED PACKAGING - Strings stay factory-fresh until you play

Ernie Ball Earthwood Rock and Blues acoustic guitar strings (10-52 gauge) feature a unique plain G-string for lead-friendly play, phosphor bronze winding for warm, clear tone, and a hex-shaped high-carbon steel core for durability. Made in the USA and sealed in Element Shield packaging, these strings deliver fresh, professional-grade sound favored by thousands of musicians.

Specifications

ASIN	B0002DUXDO
Body Material Type	Phosphor Bronze
Brand Name	Ernie Ball
Coating Description	coated
Color	Rock & Blues
Customer Reviews	4.6 4.6 out of 5 stars (2,698)
Finish Type	Uncoated
Global Trade Identification Number	00749699121510
Included Components	Plain G-string
Instrument	Acoustic Guitar
Item Type Name	Acoustic Strings
Item Weight	36 g
Manufacturer	Ernie Ball
Manufacturer Part Number	P02151
Material Type	Bronze
Model Name	Rock & Blues (10-52)
Model Number	P02151
Recommended Uses For Product	Acoustic Guitar
Set Name	Rock & Blues
Sound Profile	Balanced, warm and clear
String Gauge	Light
String Material Type	Bronze
UPC	749699121510
Unit Count	1 Count

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MX$701

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In stock

Sold byAmazon MexicoDelivered 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 Mexico.

Secure transaction

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