Why are there small fighting/cork butt ends on euro-type nymph rods?

Echo OHS (One Handed Spey) Rods, Gear Review

Best Euro Nymphing Fly Rods of 2024 - Trident Fly Fishing

Orvis Helios 3F Rod Review: A Euro-Nymphing Rod That Can Do It All

Going ultra-thin for a better Euro-nymphing rig

You can find my review of these rods at this link. , Thanks to Austin Curtin for several of the product photos., A new favorite here at Tactical Fly

Adams XTZ Euro Nymph Rod

BEST NYMPH FLY ROD to Start this Effective Nymphing Techniques - Unbelievable Underpriced for more angler to try for nymphing fishing. for drifting the nymphs from upstream to downstream accurately, the rod is deisigned with a light and sensitive tip. All for fly controlling and line mending. And also for better hooksets. You may find the plain fun for this effective way to fool the pressure sensitive trout. Nymphs or a dropper maybe the best way to catch the trout.

M Maximumcatch Maxcatch Performance Nymph Fly Fishing Rod in 2/3/4wt: 10ft/11ft, iM10 Carbon, AAA Cork Handle, Cordura Rod Tube and Combo Set

Available in 5 different styles:, Cork fighting butt, 1-1/4L, 3/8 bore, solid cork rear., Small Eva/Cork fighting butt, 1L, 3/8 bore, solid

Cork Fighting Butts

Diamondback Ideal Nymph Euronymphing Single Handed Fly Rod, Single-handed, Fly Rods

You can find my review of these rods at this link. , Thanks to Austin Curtin for several of the product photos., A new favorite here at Tactical Fly

Adams XTZ Euro Nymph Rod