Pack of 100 7/8" discs by JSP 

Made Of Moisture Resistant Aluminum Oxide PAPER With Brass Center. Designed with a flexible backing, for sanding in tight places. With a brass centers to allow you to easily snap them on to your mandrel.  Moore. Grit: fine (320). Box Of 100

Aluminum Oxide cuts sharp, helps produce a consistent scratch pattern, and works well on ferrous and non-ferrous metals

Pliable open web removes burrs and surface contaminants without gouging the substrate