We use the V2 Guardian or Phantom model with premium paint - The color does not get porous and stays even after baths or showers.
It includes 1 ring with balls sleeve only.
Measure for the base ring
Measure the circumference around your cock from behind the balls. You can use a fabric tape measure (the kind dressmakers use) to get the measurement, or, if you don’t have one, you can use a piece of string and a ruler. Wrap the tape measure or string around your cock, going behind the balls. The tape should be snug but not tight.
Now you have your circumference you need to divide it by 3.14 to get the diameter. We’ve done some sample calculations below to show you how it works: