Cody,
Hard to tell for sure without a close up of the weave of the glass.
Olympic and Olympia were the glass shafts that Glenn St. Charles marketed. The ones I have are a brown gray pretty close to the color of yours. Glenn's were smoother surface than the brown Fleetwood or yellowish Microflites.
Herter's and Shakespeare also marketed sort of brown gray glass shafts. There may be others.