mm just describes the ~Width of the Cuffs, so you are also able to wear small Cuffs with big stretched Ears.
I recommend to choose smaller Cuffs than your actual Plug Size, to create a nice dangling Look.
Material: Stainless Steel
Every Piece of Jewelry is unique and may differ from each other and from Pictures.
Please allow little Imperfections due to natural Materials and handmade Products.