These are incredibly small and the black nickel finish should help cut down on what little visibility could happen with these microscopic rings.
The ring makes changing or replacing tippet easy and doesn't effect casting, turn over or presentation. so it not only saves time, but a lot of expensive tapered leaders.
Thick profile and absolutely round circumference to prevent line damage and provides best knot strength.
Break strength 25 lb (0.1 inch) and 45 lb (0.12 inches), strong enough for any fly fishing.
The material is made of Nickel Stainless Steel,which has strong corrossion resistence and durablity.