Would this work for a 7 year old child's 1/2 sized acoustic guitar?

Don't have any 1/2 sized, but I don't see why not.

Hi, does it come with strings to tie to the guitar? Thank you.

Hello! These straps do not come with a tie string. Y2PLAY Stores - 800-695-4808

Is it good for 12 year old owns acoustic guitar?

Yes - this would be perfect for a 12-year-old. I actually bought it for a harpsicle, and I am a large man, but it extended to accommodate me and my instrument. Smaller would be no problem. This is a standard guitar strap - attractive and sturdy.

Will this work on my tuba?

Yes it will work on a tuba no problem

Ernie Ball Guitar Strap Polypro Strap 4037 Polypro Strap Black

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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Bs.298

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Sold byAmazon BoliviaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎸 Strap in, stand out — the classic that never quits!

TRUSTED BY THOUSANDS - A top-rated bestseller with over 27,000 reviews—join the community of pros who rely on Ernie Ball.
SEAMLESS STYLE FUNCTION - Sleek black design pairs with any guitar and outfit, making you stage-ready instantly.
BUILT TO LAST BUILT TO ROCK - Crafted from flexible, stretch-resistant polypropylene for long-lasting durability.
EFFORTLESS FIT FOR EVERY GIG - Smooth length adjustment from 965mm to 1700mm ensures your perfect playing comfort.
LIGHTWEIGHT COMFORT ALL NIGHT - Weighing just 79g, it stays comfortable through marathon jam sessions and tours.

The Ernie Ball Polypro Strap 4037 is a professional-grade guitar strap featuring a flexible, stretch-resistant polypropylene build and a smooth Delrin sliding adjuster. Adjustable from 965mm to 1700mm in length and 50mm wide, it offers lightweight comfort and durability, making it a top choice among guitarists worldwide.

Specifications

ASIN	B0002D0E92
Age Range Description	Teenagers and up
Amazon Bestseller	#52 in Musical Instruments ( See Top 100 in Musical Instruments ) #1 in Guitar Straps
Brand Name	Ernie Ball
Color	Black
Country of Publication	USA
Customer Reviews	4.3 4.3 out of 5 stars (27,993)
Fastener Type	Buckle
Garment Size Country	Japan
Global Trade Identification Number	00749699140375
Item Dimensions	111.8 x 0.3 x 5.1 cm
Item Type Name	Guitar Strap
Item Weight	79 g
Manufacturer	ERNIE BALL
Manufacturer Part Number	4037
Manufacturer Warranty Description	Based on the rules of manufacturer's warranty
Material Type	Polypropylene
Pattern	Single Item
Size	長さ：965mm～1,700mm、幅：50mm
Style Name	Single strap
Style Number	P04037
UPC	749699140375

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