When polishing the inside of a ring or piece, a mounted felt or cotton mop will be best suited for polishing the inside as it removes scratches. Radial discs great for cleaning findings as it reaches all those small spaces. Jewellerā€™s rouge or vert or Unipol polishing compound is a fine abrasive used on a bench polisher buff /mop & assist to achieve a mirror like finish. Always pair the correct buff with the right compound to create a magic polishing system.