They are plastic.That's a steal! Just the housing is worth most of that as scrap steel!
I have 8’ fixtures with 2 x 8’ T12 bulbs, that hang on chains, 16’ above my shop floor. The 8’ tubes are a PIA to change out.
I’m replacing the entire fixtures with these.
EnviroLite 8 ft. 4-Light White Industrial LED White Strip Light with T8 LED 5K Tubes-ST74T185 - The Home Depot
Each fixture has 4 x 4’ T8 size LED tubes.
Hey, thanks for that link. That's exactly what I need to replace the 8' fixtures in my barn. And you're right - those 8' bulbs are a PITA to change.