USA size 4 - ITALIAN size 7 - Diameter 1.4 cm
USA size 5 - ITALIAN size 10 - Diameter 1.5 cm
USA size 6 - ITALIAN size 12 - Diameter 1.6 cm
USA size 7 - ITALIAN size 14,5 - Diameter 1.65 cm
USA size 8 - ITALIAN size 17 - Diameter 1.72 cm
USA size 9 - ITALIAN size 19 - Diameter 1.82 cm
USA size 10 - ITALIAN size 21.5 - Diameter 1.95 cm
USA size 11 - ITALIAN size 24 - Diameter 2.05 cm
USA size 12 - ITALIAN size 27 - Diameter 2.1 cm