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.

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SF Fly Fishing Backing Line Braided Trout Line

SF Fly Fishing Backing Line Braided Trout Line

Q: 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.

Q: 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.

Q: 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.

Product ID: 216153665

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Details

Material
Polyester
Colour
Blue-100M
Fishing line type
Braided
Brand
SF
Line weight
20 pounds

💪20lb & 30lb breaking strength options

🧵8-strand hollow braid for max durability

☀️UV resistant polyester for long-lasting use

Frequently Bought Together

Description

🎣 Elevate your cast with backing line that’s as tough as your ambition!

SLEEK SLIM DESIGN - Slim profile lets you spool plenty without overfilling, keeping your reel balanced and ready for action.
UNMATCHED DURABILITY - 8-strand hollow braided polyester resists abrasion and fraying, ensuring your line stays strong when it counts.
SMOOTH CASTING EXPERIENCE - Low friction and excellent knotability protect your rod guides and enhance every cast.
TAILORED STRENGTH OPTIONS - Choose 20lb for freshwater finesse or 30lb for tackling salmon, saltwater, and pike with confidence.
TRUSTED QUALITY SUPPORT - SF’s commitment to customer satisfaction means hassle-free service and a product that complements all fly lines perfectly.

The SF Fly Fishing Backing Line is a premium 8-strand hollow braided polyester line available in 20lb and 30lb strengths. Designed for durability, UV resistance, and low friction, it offers anglers a slim, abrasion-resistant backing that enhances reel capacity and casting performance. Ideal for freshwater and saltwater fishing, this line is the perfect upgrade for serious fly fishers seeking reliability and smooth handling.

Specifications

Breaking strength	20 Pounds
Color	Blue-100M
Size	20LB 100m/108yds
Weight	200 g
Material type	Polyester
Batteries included?	No
Brand	SF
Manufacturer	SF
Item model number	NARF5_04938
Product Dimensions	10 x 10 x 2 cm; 50 g
ASIN	B08743P6CS

Have a Question? See What Others Asked

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

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

Is it floating line

Can I use on my fishing rod for blue gills?

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