4.33 AM (Running Shoes) Lyrics

Lyric discussion by RichardSpeck 

Cover art for 4.33 AM (Running Shoes) lyrics by Roger Waters

Also one of my favorites. I am American so I think I'm not understand something that might be common parlance for for English. I figured out Fassbinder was Rainer Werner Fassbinder but what about "gunmetal magnets". Gunmetal is a non-ferrous alloy, mostly copper. This means it's non-magnetic. There is also a gray color "gunmetal" which is similar to the color of iron ferrite. Do the English describe ferrite magnets by color?