Although discontinued by most hydro companies, fiber glass brackets can be seen in service though out many towns in Ontario including Aylmer.

Google Maps Link: https://www.google.ca/maps/@42.7692375,-80.9783458,3a,90y,114.95h,100.24t/data=!3m6! 1e1! 3m4! 1s_kYXcZNVz18P2xfGvr0DSA! 2e0! 7i13312! 8i6656

Photo Credit: Google Maps