The first one looks like it might be pewter, it weighs 10.2 g and is 27 mm. The other two are 13.5 g and close to 29 1/2 mm
I found a few more pope medals, are these silver? The first two images here are the obverse and reverse of a 16.1 g 35 mm medal. The second two images are the obverse and reverse of a 16.1 g 35 mm medal.