I have 5wt line. Which backing should i get? (20lb or 30lb)?

it depends on your fly reel. all fly reels are not equal. I have a 7/8 wght fly reel and end up only using maybe not even half of the 30lbs backing that I got. if you are not catching 30lb plus fish, go with 20lb backing. but if your reel is holds a lot of line than go with 30lb. hope this helps☺have a great day. this line is soft/strong & it benefits the fly line well.

what are the diameters (in mm) for each one?

The line it’s self has all the info I received. Sorry I do not have a caliber gauge to measure mm.

Since this is only backing, no it isn't a floating line. It's not coated and will sink unlike the main fly line, assuming that it is a floater.

Can I use on my fishing rod for blue gills?

This product is FLY LINE BACKING... This product is intended to be used as backing line on a fly reel, NOT as a main line. If you're using your set up to fish for blue gills (or anything else really), yeah, this will work on your fly reel, followed by fly line, then a leader, and finally some tippet to the fly itself.

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SF Fly Fishing Backing Line Braided Trout Line

Product ID: 216153665

Details

Brand
SF
Colour
Blue
Fishing line type
Fly
Line weight
0.17
Material
Polyester

💪20lb & 30lb breaking strength

🧵8-strand hollow braid

☀️UV resistant polyester

€ 24.47

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Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎣 Reel in the future with backing line that’s as tough as your ambition!

BUILT TO LAST - 8-strand hollow braid offers unbeatable abrasion resistance and durability.
SMOOTH CASTING - Low friction design protects your rod guides and ensures effortless knots.
SLIM YET MIGHTY - High-quality polyester keeps your reel light and rot-proof without bulk.
TAILORED STRENGTH - Choose 20lb for freshwater finesse or 30lb for saltwater power plays.
VIBRANT VISIBILITY - Available in white, orange, and high-visibility yellow to match your style and conditions.

SF Fly Fishing Backing Line features an 8-strand hollow braided polyester construction that is slim, rot-proof, and UV resistant. Available in 20lb and 30lb breaking strengths, it offers superior abrasion resistance and low friction for smooth casting. Perfectly designed to complement all fly lines, it comes in multiple high-visibility colors and lengths of 108 yards, making it the go-to choice for both freshwater and saltwater anglers seeking reliability and performance.

Specifications

ASIN	B08743P6CS
Best Sellers Rank	7,044 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) 2 in Fly Fishing Lines
Brand Name	SF
Breaking Strength	20 Pounds
Colour	Blue
Country Of Origin	China
Customer Reviews	4.7 4.7 out of 5 stars (2,204)
Fishing Line Type	Fly
Included Components	Backing Line
Item Length	108 Yards
Line Weight	0.17
Manufacturer	SF
Manufacturer Part Number	FL0409B
Manufacturer Warranty Description	No Warranty
Material Type	Polyester
Model Number	NARF5_04938
Number of Items	1
Size	20LB 100m/108yds
Strand Type	Multi
Unit Count	1.0 count

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€ 24.47

Duties & taxes included

In stock

Sold byAmazon CroatiaDelivered 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 Croatia.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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Excellent communication throughout the order process. Product is perfect.

2 weeks ago

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The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

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