HOME LAMINATION RINGCORE           TYPE A B C D E F G H I J T GRADE RING 12.2 8.80 12.20 0.35 PC RING 13.3 9.80 13.30 0.35 PC RING 15 11.00 15.00 0.35 PC RING 17.9 13.30 17.90 0.35 PC