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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Ernieball Earthwood 12-String Light Phosphor Bronze Acoustic Guitar Strings - 9-46 Gauge

Ernieball Earthwood 12-String Light Phosphor Bronze Acoustic Guitar Strings - 9-46 Gauge

Product ID: 340225270

Details

Brand
Ernie Ball
Colour
12-String
Instrument
Acoustic
String Gauge
Light
String Material Type
Phosphor

🎸12-string rich harmonic layers

⚖️Light gauge 9-46 for effortless play

🛡️Phosphor bronze durability

€ 24.63

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Description

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

BUILT TO LAST - Phosphor bronze construction ensures long-lasting brightness and corrosion resistance.
HARMONIZE LIKE A PRO - Experience lush, full-bodied tones with 12-string layering that elevates every chord.
TRUSTED BY THOUSANDS - Join over 39,000 players who rate these strings 4.5 stars for unbeatable value and quality.
UNCOATED AUTHENTICITY - Pure, natural sound without coatings that dampen your guitar’s true voice.
EFFORTLESS PLAYABILITY - Light 9-46 gauge strings reduce finger fatigue, perfect for extended sessions.

Ernieball Earthwood 12-String Light Phosphor Bronze Acoustic Guitar Strings (9-46 gauge) deliver warm, rich tones with durable phosphor bronze material. Designed for 12-string guitars, these uncoated strings offer effortless playability and authentic sound, making them a top choice for beginners and intermediate players alike. Highly rated with over 39,000 reviews, they combine quality and value in a trusted American-made product.

Specifications

ASIN	B0002DUPZA
Best Sellers Rank	#1,084 in Musical Instruments ( See Top 100 in Musical Instruments ) #25 in Acoustic Guitar Strings
Body Material Type	Phosphor Bronze
Brand Name	Ernie Ball
Coating Description	Uncoated
Colour	12-String Light (9-46)
Country of Origin	USA
Customer Reviews	4.5 4.5 out of 5 stars (39,295)
Finish Type	Bronze Plated
Global Trade Identification Number	00749699121534
Importer Contact Information	MUSIC & MORE DIST.CO.PVT.LTD. C-4 to C-11 GATE NO- 3 Hosiery Complex Phase 2 Noida 201305
Included Components	12-string light gauge acoustic guitar strings
Instrument	Acoustic Guitar
Item Type Name	Acoustic Guitar String
Item Weight	45 g
Manufacturer	ERNIE BALL STRINGS, 151 Suburban Rd.San Luis Obispo,CA 93401,USA, ERNIE BALL STRINGS, 151 Suburban Rd.San Luis Obispo,CA 93401,USA
Manufacturer Contact Information	ERNIE BALL STRINGS, 151 Suburban Rd.San Luis Obispo,CA 93401,USA
Manufacturer Part Number	P02153
Material Type	Phosphor Bronze
Model Name	12-String Light (9-46)
Model Number	P02153
Number Of Items	1
Number of Packs	1
Packer Contact Information	ERNIE BALL STRINGS, 151 Suburban Rd.San Luis Obispo,CA 93401,USA
Recommended Uses For Product	Acoustic Guitar
String Gauge	Light
String Material Type	Phosphor Bronze
UPC	749699121534
Unit Count	1 Count
Warranty Description	1 Year Manufacturer

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