You want something that will be
snug when erect, but not so tight that you cut off circulation and cause
tissue damage. To measure yourself for a stainless steel cock ring, get hard, and then take a
string and slip it behind your balls and tug it up snug around the top
of your cock close to your body. Mark the string on both sides where it
comes together at a snugness that's comfortable for you. Remove the
string and measure between the marks. This process is even simpler if
you have a cloth tape-measure like tailors use. Whatever you use to
measure, that will give you your package circumference. Our solid rings
are measured by the inside diameter, which means you'll need to divide
by pi (3.14). A 2" diameter wholesale cock ring will fit snugly on a man with a
6.28" circumference package.