Bakelite? Sierra electric corp mid century modern ribbed outlet switch covers

Description

Sierra electric corp made in USA what I believe are Bakelite but I don't know 100% that they are, please look closely and let me know if any questions  outlet covers and switch plate covers
All in great condition
Three Switch covers and two outlet covers
Came out of my dads ranch house that was built in 1959.
From non smoking home
No returns accepted