Measuring

There are two sizes of interest:

Back Ring Diameter

This is the diameter of the back ring, ie the distance from side to side of the hole inside the ring. Where the back ring isn't a perfect circle, take the average of the widest and narrowest diameter.

If you don't know your standard cock-ring size, you can measure yourself - take a string and tie snug around your cock and balls. Snug but not the tight to restrict blood flow... cut string off and measure... divide by 3.14 and the result is the ring size.

When cages are sold and you need to choose a back ring, the usual sizing used is:

• Small is 40mm or 1.5 inches
• Medium is 45mm or 1.75 inches
• Large is 50mm or 2 inches

...approximately, as those conversions aren't exact!

Cage Length

This is the distance from the back ring to the front of the cage, measured through the middle of the cage (ie through the centre line of where your cock would be). This can be approximate as it's not easy to measure a curve inside a curved cage.

If you want a tight fit, this can be the same length as your flaccid cock squashed down, but if it's your first cage you might want to be more generous with the measurement. The general opinion is that it doesn't need to be as big as your erect cock - any pressure from expanding inside a cage that's smaller than your erect cock is not painful.