SIZING & MEASUREMENT QUESTIONS
How do I measure myself for a cock ring?
Take a string or thin strip of paper and slip it behind your balls and tug it up around the top of your penis (where it meets your body). Mark the string or paper on both sides where it comes together at a snugness thats comfortable for you. Remove the string and measure between the marks. This measurement will give you your circumference. Now take your circumference measurement and divide by pi (that's 3.14...sorry to make you do math, but we want to make sure it fits you right!). This measurement will give you your diameter or cock ring size.
Measuring for the Head/Shaft rings is very similar. You would measure the same way, at the place you want to wear it (either just behind the head or down on the shaft), and also measure it in the state you would want to wear it (soft or hard). Note: The head & shaft rings are meant purely as ornamental jewlery. Go as close to that size as you feel will be comfortable for you.