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 Medium Phosphor Bronze Acoustic Guitar Strings, 13-56 Gauge

Product ID: 10670878

Details

Brand
Ernie Ball
Color
Medium (13-56)
Instrument
Acoustic
String Gauge
Medium
String Material Type
Steel

🎸Medium 13-56 gauge for rich, bold sound

🛡️Element Shield Packaging for extended freshness

🇺🇸Made in California with premium materials

56.42 DT

Duties & taxes included

In stock

Sold byAmazon TunisiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎶 Elevate your sound with strings that never quit!

BIGGER SOUND MORE CONTROL - Medium gauge strings (13-56) provide enhanced tension and fuller resonance, perfect for expressive playing.
TRUSTED BY PROS LOVED BY ALL - Top-ranked acoustic guitar strings with thousands of 5-star reviews—join the community of discerning musicians.
CRAFTED IN THE HEART OF INNOVATION - Proudly made in California using the finest materials, ensuring consistent quality and reliability.
FRESHNESS SEALED IN LONGEVITY LOCKED - Element Shield Packaging keeps your strings as vibrant as the day they were crafted—no more dull tones.
RICH WARM TONE THAT COMMANDS ATTENTION - Phosphor bronze winding delivers unmatched clarity and projection for your acoustic performances.

Ernie Ball Earthwood Medium Phosphor Bronze Acoustic Guitar Strings (13-56 gauge) offer a warm, rich tone with excellent clarity and projection. Featuring phosphor bronze wound on a hex-shaped high-carbon steel core, these strings deliver a bigger sound with balanced tension. Packaged with Element Shield technology to maintain freshness and durability, they are proudly made in California and favored by professionals and enthusiasts alike.

Specifications

ASIN	B0002DUQ0O
Best Sellers Rank	#47 in Musical Instruments ( See Top 100 in Musical Instruments ) #4 in Acoustic Guitar Strings
Body Material Type	Phosphor Bronze
Brand	Ernie Ball
Brand Name	Ernie Ball
Coating Description	coated
Color	Medium (13-56)
Customer Reviews	4.6 out of 5 stars 5,757 Reviews
Finish Type	Uncoated
Global Trade Identification Number	00749699121442
Included Components	Guitar Strings only
Instrument	Acoustic Guitar
Item Type Name	Acoustic Guitar Strings
Item Weight	0.04 kg
Manufacturer	Ernie Ball Music Man
Manufacturer Part Number	P02144
Model Name	Medium (13-56)
Model Number	P02144
Number of Items	1
Recommended Uses For Product	Acoustic Guitar
Set Name	Earthwood
Sound Profile	Warm, Balanced
String Gauge	Medium
String Material Type	Steel
UPC	749699121442
Unit Count	1 Count
Warranty Description	None.

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56.42 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

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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3 weeks ago

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