I.          Stains on core pad

a)        Stains on core pad larger than 0.5 mm in size

b)       Stain type: black spots, insects, dark glue, dark oil and etc.

II.       Gap between two core pads > 1mm

III.      Core pad position deviation > 1mm

IV.     Core pad absence

I.          Stains on surface fabrics

a.      Stains on surface fabrics larger than 0.5 mm in size;

b.      Stain type: black spots, insects, dark glue, dark oil and etc.

II.       Nose bridge missing, length discrepancy