It looks like you’re referencing the 2018 IM12 high-quality nymph fly rods from Loomis and Franklin. Here’s what I found based on your query:

Loomis (G. Loomis) & Franklin (Possibly a Custom Builder or Smaller Brand)
1. G. Loomis IMX/IM12 Series
– G. Loomis is a well-known premium rod manufacturer, and their IMX-Pro series (which uses IM12 graphite) was released around 2018.

Loomis and Franklin new for 2018 IM12 hi quality blank Nymph rods . fly rods

– These rods are lightweight, sensitive, and designed for precision nymphing (Euro-style or tight-line techniques).
– Models like the NRX LP (Light Presentation) or IMX-Pro Nymph rods were popular for competition-style fishing.

2. Franklin Fly Rods
– Less widely known—could be a custom builder or smaller brand.
– If they collaborated with Loomis or used IM12 blanks, they might have offered specialized nymph rods.

Key Features of IM12 Nymph Rods (2018 Era)
– IM12 Graphite: High-modulus blank for sensitivity and fast recovery.
– Lengths: Typically 10’–11′ for Euro-nymphing or 9’–10′ for general nymphing.
– Action: Fast or extra-fast with a soft tip for delicate presentations.
– Line Weights: Usually 2–4 wt for competition nymphing.

If You’re Looking to Buy or Identify One
– Check labels for “IM12” or “G. Loomis IMX-Pro”.
– Franklin rods (if custom) may have unique markings.
– Used market (eBay, forums) may have 2018-era models.

Would you like help finding specific models or retailers? Let me know!