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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2151 Ernieball Hybrid Slinky Phos.Brnz Acc.Gtr Stg10-52

2151 Ernieball Hybrid Slinky Phos.Brnz Acc.Gtr Stg10-52

Product ID: 83555268

Details

Brand
Ernie Ball
String Gauge
.01
Colour
Blue Red
Instrument
Acoustic
String Material Type
Phosphor

⚡Hybrid Slinky gauge 10-52 for versatile play

🎸Phosphor Bronze for rich tone

🔒Coated for long-lasting tuning stability

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$U833

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Details

Brand
Ernie Ball
String Gauge
.01
Colour
Blue Red

Description

🎶 Elevate your acoustic game with strings that never quit!

RICH RESONANT TONE - Phosphor bronze delivers warm, balanced sound perfect for acoustic pros.
PRO LEVEL DURABILITY - Engineered to resist corrosion and wear, ensuring consistent performance.
TRUSTED BY THOUSANDS - Top-rated with 38,000+ reviews and a 4.6-star average—join the elite players.
VERSATILE HYBRID GAUGE - 10-52 gauge strings blend bright highs with deep lows for dynamic playing styles.
TUNING STABILITY THAT LASTS - Advanced coating keeps your strings in tune through intense sessions.

Ernie Ball 2151 Hybrid Slinky Acoustic Guitar Strings (10-52 gauge) feature premium phosphor bronze construction with a protective coating for enhanced durability and tuning stability. Designed for acoustic guitarists seeking a bright yet balanced tone, these strings are a top choice globally, boasting over 38,000 positive reviews and a 2-year manufacturer warranty.

Specifications

ASIN	B0002DUXDO
Best Sellers Rank	#1,340 in Musical Instruments ( See Top 100 in Musical Instruments ) #40 in Acoustic Guitar Strings
Body Material Type	Phosphor Bronze
Brand	Ernie Ball
Brand Name	Ernie Ball
Coating Description	coated
Colour	Blue, Red
Country of Origin	USA
Customer Reviews	4.6 out of 5 stars 38,423 Reviews
Finish Type	Copper
Global Trade Identification Number	00749699121510
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	Plain G-string
Instrument	Acoustic Guitar
Item Type Name	Acoustic Guitar Strings
Item Weight	0.08 Pounds
Manufacturer	ERNIE BALL STRINGS, 151 Suburban Rd.San Luis Obispo,CA 93401,USA, Ernie Ball
Manufacturer Contact Information	ERNIE BALL STRINGS, 151 Suburban Rd.San Luis Obispo,CA 93401,USA
Manufacturer Part Number	P02151
Material Type	Phosphor Bronze
Model Name	Rock & Blues (10-52)
Model Number	P02151
Packer Contact Information	ERNIE BALL STRINGS, 151 Suburban Rd.San Luis Obispo,CA 93401,USA
Recommended Uses For Product	Acoustic Guitar
Set Name	Rock & Blues
Sound Profile	Warm and Versatile
String Gauge	.01
String Material Type	Phosphor Bronze
UPC	749699121510
Warranty Description	2 Year Manufacturer

Reviews

C**Y

15.01.2025

C**A

19.12.2024

V**N

22.07.2025

A**L

1.04.2017

A**R

2.06.2025

S**H

22.04.2025

V**S

7.10.2024

R**R

14.02.2019

A**R

11.02.2026

R**E

16.07.2023

A**.

15.02.2026

L**S

22.01.2026

C**T

7.12.2025

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