Hello,
In our church model 5 years ago, we got new metal doors with windows in them. The weather stripping in the picture has worn and ripped (it is made of a rubber material, no plastic or metal parts) and it slides right into a slot on the door. I think it is weatherstripping. The width of the "T" part of the weatherstrip is about 3/16."
Looked up some contractor paperwork and it may be PEMKO 303DV related but I checked with them and they said it wasn't. I was told to email it to you guys. What do you think this rubber part is?