Slotted Tungsten 3.5mm Beads by Flybox

Flybox:-

"Slotted Tungsten Beads feature an enlarged slot recess which allows you to easily get the hooks around the gape of the hook.  More importantly helps position the fly above the eye of the hook for tying river flies.  This forward balance is particularly effective when tying on jig hooks."

MFF:-

We use these hooks on our very own tungsten jig nymph flies - 20 beads per bag