Runouts are etched except 'MASTERDISK' which is stamped. Matrix / Runout: PRO-1224A (Label side A) Matrix / Runout: PRO-1224B (Label side B) Matrix / Runout: A- ᐉ- PRO-1224-A MASTERDISK HW (Side A runout) Matrix / Runout: A-B- ᐉ- PRO1224-B- MASTERDISK (Side B runout)