These Tungsten Rings are Cobalt Free, to avoid allergies and they have the Carbide to make them Scratch Resistant. Ladies' Sizes are available from J to X. and they are readily selectable from the drop down menu. Men's Sizes are available from N to Z+2 (), but you have to let us know of your size preference upon placing the order. They'll surely make Earnest Symbols of Love, Devotion and Commitment to the One you've chosen to spend the rest of your life with. Please feel free to contact us for any inquiries.