Size: 7 to 12, width of about 7MM Material: titanium European Code control: 6=diameter 16mm size (size Label 16) 50.3mm =circumference 7=diameter 17.5mm size (size Label 17) 54.9mm =circumference 8=diameter 18.5mm size (size Label 18) 58.1mm =circumference 9.5=diameter 19.5mm size (size Label 19) 61.2mm =circumference 11=diameter 20.5mm size (size Label 20) 64.3mm =circumference 12=diameter 21.5mm size (size Label 21) 67.8mm =circumference 13=diameter 22.5MM size (size Label 22) 70.7mm =circumference Refers to the circumference measurement methods: Ring usually worn on the index finger, middle finger or ring finger, with a cord or tape around the finger a ring and get the perimeter, and find the corresponding number in the table. Because the finger joints is slightly larger than the ring, so tightly around the line do not. If the size between the two sizes, please choose the larger size;