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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Earthwood Phosphor Bronze Series

Product ID: 741477913

Details

Brand
Ernie Ball
Color
medium light
Instrument
Acoustic
String Gauge
Custom
String Material Type
Phosphor

🎸Medium light gauge (.012-.054) for balanced playability

🛡️Hexagonal high-carbon steel core for durability

🇺🇸Made in USA with premium fresh materials

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€ 15.12

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Sold byAmazon NetherlandsDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎶 Elevate your acoustic vibe with strings that sing clarity and durability

BUILT TO LAST - High-carbon steel core ensures long-lasting strength and tuning stability
TRUSTED CHOICE - Top-rated with 33,000+ reviews and bestseller status
RICH WARM TONE - Phosphor bronze winding delivers vivid sound clarity
FRESH FROM FACTORY - Sealed packaging preserves new-string feel and tone
PERFECT GAUGE BALANCE - Medium light strings offer ideal tension for versatile play

Ernie Ball Earthwood Phosphor Bronze Acoustic Guitar Strings feature a medium light gauge (.012-.054) with a hexagonal high-carbon steel core and phosphor bronze winding, delivering warm, rich tones and superior clarity. Made in the USA with premium materials and sealed packaging, these strings ensure fresh sound and long-lasting performance, making them a top choice among professional and aspiring guitarists alike.

Specifications

ASIN	B0002DUQ04
Amazon Bestseller	#771 in Musical Instruments ( See Top 100 in Musical Instruments ) #39 in Guitar Strings
Brand Name	Ernie Ball
Coating Description	Uncoated
Color	medium light (12-54)
Country of Origin	USA
Customer Reviews	4.3 4.3 out of 5 stars (33,868)
Finish Type	Uncoated
Global Trade Identification Number	00749699121466
Instrument	Acoustic Guitar
Item Type Name	Acoustic Guitar Strings
Item Weight	5 g
Manufacturer	ERNIE BALL
Manufacturer Part Number	P02146
Model Number	P02146
String Gauge	Custom
String Material Type	Phosphor Bronze
UPC	749699121466
Warranty Description	In accordance with manufacturer's warranty regulations

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