Material Wear A 13.2 A 8.2 A 10.9 A 14.3 A 10.7 A 6.6 A 9.5 A 10.8 A 8.8 A 13.3 B 14 B 8.8 B 11.2 B 14.2 B 11.8 B 6.4 B 9.8 B 11.3 B 9.3 B 13.6