It looks like you’re referencing a product called “DOOHICKEY THINGAMABOBBERS”—a fly fishing strike indicator available in 4 sizes and colors.

Key Features (Assuming Based on the Name & Description):
✔ Strike Indicator – Helps detect subtle strikes when nymphing or fishing subsurface flies.

DOOHICKEY THINGAMABOBBERS - Fly Fishing Strike Indicator - 4 Sizes & Colors NEW!

✔ 4 Sizes – Likely caters to different water conditions (smaller for delicate presentations, larger for rough water).
✔ Multiple Colors – High-visibility options for better tracking in various light conditions.
✔ “Thingamabobber” Style – Probably a buoyant, removable foam or plastic indicator that attaches easily to the leader.

Why Use It?
– Improves strike detection in nymphing setups.
– Easy to adjust on the line.
– Lightweight & sensitive for natural drifts.

If you’re looking for reviews, comparisons, or tips on using them, let me know! Are you considering buying them or comparing with other brands like Oros, New Zealand Strike Indicators, or Airlock?

🎣 Pro Tip: Pair with a suspender nymph rig or Euro-nymphing setup for best results!