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!

ASIN	B0002DUQ04
Body Material Type	Bronze
Brand	Ernie Ball
Brand Name	Ernie Ball
Coating Description	uncoated
Coating description	uncoated
Color	Medium Light
Colour	Medium Light
Customer Reviews	4.7 out of 5 stars 34,275 Reviews
Finish Type	Bronze Plated
Global Trade Identification Number	00749699121466
Included Components	Strings only
Instrument	Acoustic Guitar
Item Type Name	Acoustic Strings
Item Weight	0.01 Pounds
Manufacturer	Ernie Ball
Material Type	Bronze
Model Name	Medium Light (12-54)
Model Number	P02146
Recommended Uses For Product	Acoustic Guitar
String Gauge	Medium
String Material Type	Bronze
String gauge	Medium
String material type	Bronze
UPC	749699121466
Unit Count	1 Count

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