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シリーズ

Product ID: 741477913

Details

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

🎸Medium light gauge (12-54) for balanced playability

🛡️Sealed packaging ensures fresh strings every time

🇺🇸Made in USA with premium phosphor bronze

67 zł

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Sold byAmazon PolandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎶 Elevate your acoustic vibe with strings that speak your style

FRESHNESS GUARANTEED - Sealed packaging locks in freshness from factory to your fingers
VIBRANT WARMTH CLARITY - Experience rich, resonant tones that cut through every mix
PERFECT MEDIUM LIGHT GAUGE - Ideal balance of playability and full-bodied sound for pros
PREMIUM PHOSPHOR BRONZE CORE - Hexagonal high-carbon steel core wrapped in phosphor bronze for durability and tone
TRUSTED AMERICAN CRAFTSMANSHIP - Proudly made in the USA with top-tier materials for consistent quality

Ernie Ball Earthwood Phosphor Bronze Acoustic Guitar Strings (12-54) deliver a warm, rich tone with exceptional clarity. Featuring a medium light gauge set with a hexagonal high-carbon steel core wrapped in phosphor bronze, these uncoated strings are made in the USA and sealed to maintain freshness. Perfect for professional and passionate guitarists seeking reliable, vibrant sound and durability.

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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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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67 zł

Duties & taxes included

In stock

Sold byAmazon PolandDelivered 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 Poland.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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Very impressed with the quality and fast delivery. Will shop here again.

4 days ago

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