I get the "No Nonsense" off black regular, 3x size.
No mention of denier, but steer away from support versions as the weave density is too high for good airflow.
I got the 3x so there's more filter material per purchase (same price), and the (X) .Mrs wouldn't steal them.
I've not found an adhesive yet that melts them, but model cement works too. Color is unaffected by glues (not always the case).
3 pair for $5, not bad for several years supply of air filters.