Fiber disc 7"X7/8"-100 grit (blue)

What is for sale: Fiber disc 7"X7/8"-100 grit (blue)

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Fiber Disc 7"x7/8"-100 Grit (Blue)
Resin Bonded Fiber Disc (100 Grit-Zirconia)
Machine: Electric Right Angle Grinder with Disc Backer, Air Grinder
Use: Sanding and Polishing Welds, Rough Edges, Etc. For Mild Steel, Iron, Stainless, Aluminum, etc.
Wear eye, face & body protection. Do not drop. Mount wheel & use wheel properly per ANSI B7.1 OSHA. Use guards.
What is the difference between Zirconia (Blue) and Aluminum Oxide (Red)?
The Zirconia (Blue) discs are made using better materials and should only be used on Stainless Steel and Aluminum. Both Red and Blue can be used on Iron, Steel, Etc.