A silicone sleeve to cover and protect your knots. It works great as a strike point on your tube flies fished with free hanging hook, which many experienced salmon and sea trout anglers prefer. This minimizes the lever effect that a hook threaded inside a stiff tube can give.
The brighter colors orange and yellow are highly fluorescent. Available in two sizes, #2 and #3.
The sleeve also works great as a knot cover on your fly line-leader connection to give a smooth transition that doesn’t stick in the guides on your rod.