Polystyrene

I've had mine at least 20 years, probably more.
I agree that polystyrene is environmentally unfriendly yet its still used for packaging and cannot be reused.

I think my six modules were about 20 years old too.
So not that environmentally unfriendly when compared to single use plastic. I must’ve got through hundreds of flimsy single use plastic ones over the same period.
Our  local council accepts polystyrene in general household rubbish that goes to the incinerator, so although not ideal, it‘s not going to landfill.