Available in .925 sterling silver - measurements available are 4.5 millimeters ( 1.2 millimeters, 1.8 millimeters, 2.1 millimeters, 3.8 millimeters, 4.5 millimeters, 5.8 millimeters, 7.7 millimeters, 8 millimeters, 9 millimeters, 11.7 millimeters upon request )