Fiber or Eithenet

I recommend Linkup CAT 8 - 26AWG from your router to SGC. Send a message to manufacturer through Amazon for custom length.
https://a.co/d/cmi1QmN

Just to clarify SGC is next to the router in another room.  Looking to pull cable from a switch next to the SGC to my audio room some 50 feet away.  It is that cable I need to put in place.  Thanks for the recommendation.  

Sorry new cable will go from switch next to SMC in a separate room  to audio room connecting a Bricasti M1 with network card.    

That long a run get a quality Media Converter like the Sonore Optical Module. https://www.sonore.us/opticalModule-Deluxe.html

Finisar SFP FTLX1475DFBCL and LC-LC-SM-DX-0S2 Corning Fiber. https://www.amazon.com/Fiber-Patch-Cable-Single-Duplex/dp/B00T89DIQW/ref=asc_df_B00T89DIQW/?tag=hyprod-20&linkCode=df0&hvadid=693418895745&hvpos=&hvnetw=g&hvrand=2785120018893449731&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=1026899&hvtargid=pla-353208159507&mcid=de49865fd06b37f29def0e7ae4fca560&th=1

For 50FT run, Linkup cable would be more than adequate for your application.