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 & Blues Phosphor Bronze Acoustic Guitar Strings, 10-52 Gauge (P02151)

Product ID: 10583819

Details

Brand
Ernie Ball
Color
Rock & Blues
Instrument
Acoustic
String Gauge
.01
String Material Type
Phosphor

🎸10-52 gauge for versatile play

🛡️Element Shield Packaging for freshness

🇺🇸Made in California with premium materials

55.92 DT

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Description

🎶 Elevate your acoustic game with strings that sing and last!

CRAFTED IN THE USA - Proudly made in California using the finest materials, ensuring consistent quality and reliability.
PRECISION GAUGE SET - 10-52 gauge strings offer the perfect tension balance for dynamic rhythm and articulate solos.
LEAD READY PLAIN G STRING - Unwound G-string optimized for expressive lead playing, bridging electric and acoustic styles seamlessly.
DURABILITY MEETS FRESHNESS - Element Shield Packaging locks in freshness and extends string life, so you stay performance-ready longer.
RICH WARM TONE WITH CLARITY - Phosphor bronze winding delivers a balanced, vibrant sound that stands out in any jam session.

Ernie Ball Earthwood Rock & Blues Phosphor Bronze Acoustic Guitar Strings (10-52 gauge) feature a warm, rich tone with excellent clarity, enhanced by a plain G-string ideal for lead playing. Made in California with premium phosphor bronze wound on a hex-shaped steel core, these strings come in Element Shield Packaging to maintain freshness and durability, perfect for professional and passionate acoustic guitarists.

Specifications

ASIN	B0002DUXDO
Best Sellers Rank	#51 in Musical Instruments ( See Top 100 in Musical Instruments ) #7 in Acoustic Guitar Strings
Body Material Type	Phosphor Bronze
Brand Name	Ernie Ball
Coating Description	coated
Color	Rock & Blues (10-52)
Customer Reviews	4.7 4.7 out of 5 stars (2,860)
Finish Type	Uncoated
Global Trade Identification Number	00749699121510
Included Components	Plain G-string
Instrument	Acoustic Guitar
Item Type Name	Acoustic Guitar Strings
Item Weight	1.28 ounces
Manufacturer	Ernie Ball Music Man
Manufacturer Part Number	P02151
Material Type	Phosphor Bronze
Model Name	Rock & Blues (10-52)
Model Number	P02151
Number of Items	1
Recommended Uses For Product	Acoustic Guitar
Set Name	Ernie Ball Earthwood Rock & Blues Phosphor Bronze
Sound Profile	Warm and Clear with Prominent Bass and Treble
String Gauge	.01
String Material Type	Phosphor Bronze
UPC	749699121510
Unit Count	1 Count
Warranty Description	None.

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55.92 DT

Duties & taxes included

In stock

Sold byAmazon TunisiaDelivered 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 Tunisia.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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