My old fingers cant manage heavier gage strings anymore. anybody happy with "extra lights" 10-47's ? is the ease of play worth the loss in tone?

You might try silk and phosphor 11- 47. They play easily while maintaining the more traditional tone. .115 - 47 silk and steel play well but are very mellow tonally. Alot has to do with the guitar itself and of course personal preference. Additionally, you may have to set the guitar up again. The strings will ride slightly lower in the saddle and nut. And they will not pull the neck as much. No easy way other than trial and error. I have 17 acoustics and have tried several sets on each guitar before settling on what I like on that particular guitar. Only 2 of the 17 uses the same strings. Good luck.

Anyone using these for fingerstyle blues? What do you think of them?

I only play fingerstyle, and I play blues, jazz, pop...I LOVE these strings. If you're not plugged in you may notice a little less volume. Nothing drastic. They sound a bit more "warm." Slides are sweet. They're not that expensive. (I have used another brand that cost something like $30. They are a little nicer, but I can't afford that luxury all the time.) Try a set. Your fingers will thank you.

Is the core in of the d'addario eft15 round core?

Down in the product details at the bottom of the page -- "D'Addario Phosphor Bronze strings are precision wound with corrosion-resistant phosphor bronze onto a carefully drawn, hexagonally shaped, high carbon steel core. " Note the "hexagonally shaped, high carbon steel core" so NOT a round core.

Wait a second, the title for the item is flattened, the description page says roundwound, and one of the answers says they are halfwound. Which is it?

They are flattened. Flat round is a different type of string. Basically its like the small humps of the round string are ground down .

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Flat Tops Phosphor Bronze Strings EFT16, 12-53

Product ID: 1371901

Details

Brand
D'Addario
Color
Bronze
Instrument
Acoustic
String Gauge
Light
String Material Type
Phosphor

🎸Precision wound for flawless tone

⚙️Polished semi-flat surface reduces finger noise

🇺🇸Made in USA with exacting specs

₱2531

Duties & taxes included

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Sold byAmazon PhilippinesDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎶 Elevate your acoustic game with the smoothest, warmest strings in the room!

LIGHT GAUGE VERSATILITY - 12-53 gauge strings strike the ideal balance between playability and rich acoustic resonance—your go-to for effortless performance.
STUDIO READY SMOOTHNESS - Precision ground phosphor bronze wrap delivers a silky, semi-flat feel that slashes finger noise—perfect for recording and slide guitar pros.
BALANCED WARMTH CLARITY - Experience the iconic D’Addario tone with a warm yet semi-bright sound that fits every genre and playing style.
TRUSTED LEGACY MODERN PRECISION - Crafted in New York with state-of-the-art machinery, these strings set the industry standard since the 1970s.
ECO CONSCIOUS PACKAGING REWARDS - Recyclable VCI bag includes a Players Circle code—earn points while reducing waste and upgrading your gear.

D'Addario Flat Tops Phosphor Bronze Strings EFT16 (12-53) are precision wound with a phosphor bronze wrap over a high-carbon steel core, then polished to a semi-flat finish that reduces finger noise. Made in the USA, these light gauge strings deliver a balanced warm and semi-bright tone ideal for recording, slide playing, and all musical genres. Packaged in recyclable bags with reward points, they combine legacy craftsmanship with modern innovation for consistent, studio-quality performance.

Specifications

ASIN	B0006IQN2U
Best Sellers Rank	#2,837 in Musical Instruments ( See Top 100 in Musical Instruments ) #43 in Acoustic Guitar Strings
Body Material Type	Phosphor Bronze
Brand Name	D'Addario
Color	Bronze
Customer Reviews	4.6 4.6 out of 5 stars (711)
Finish Type	Polished
Global Trade Identification Number	00019954121235
Included Components	6 guitar strings
Instrument	Acoustic Guitar
Item Highlight	Flat Tops phosphor bronze acoustic strings deliver warm semi-bright tone, smooth feel, reduced noise and stable tuning.
Item Type Name	Acoustic Upright Bass
Item Weight	2.86 g
Manufacturer	D'Addario &Co. Inc
Manufacturer Part Number	EFT16
Material Type	Phosphor Bronze
Model Name	EFT16
Model Number	EFT16
Number of Items	1
Recommended Uses For Product	Acoustic Guitar
Set Name	EFT16
Sound Profile	Warm, Semi-Bright
String Gauge	Light
String Material Type	Phosphor Bronze
UPC	019954121235
Warranty Description	D'addario strives to be a customer-centric company dedicated to producing the highest quality musical instrument accessories in the world. If you have purchased a d'addario product that you believe to be defective, we invite you to submit a contact us form, selecting defect/warranty as inquiry type. We are committed to providing a fair resolution and hope that you will want to continue supporting …

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