Frost: Material with polished surface processed with fiber emery wheel. No.4: Material with highly corrosion resistant surface obtained by polished with 150 to 180 mesh. HL: Material with silver, white brusheded surface. No.8: Highly reflective material produced through buffing a finely ground surface. Super Mirror: More reflective than the No.8 Material. Color: Material with lustrous surface in a variety of colors.