How to choose a cobra cage perfectly fit you? It is an art but not easy to select a ideal cobra cage size. With this guide, you will know how to measure for a cobra chastity cage easily. The right cage for you is tight but not painful, which will not make you uncomfortable. Read on this article to get the tricks on how to measure for a cobra cage and cobra ring.

Step 1. Measure the cobra cage's length - Find your length

Allow the penis to hang naturally when measuring the flaccid length. Measure along the top of the penis from the base to the tip.
Please Note: Stand up straight with your back straight. Place the edge of the ruler against the base of your penis and place it flat against the top of your penis. Place the ruler firmly against your pubic bone, which will measure accurately.

We recommend measuring it a few times during the day in "normal" situations - not after a hot shower or when it's very cold.

Step 2. Measure the Cobra Cage's Perimeter

Our cobra cage' entrance size as image below. The diameters are respectively 34mm and 39mm. For nub, the tube entrance diameter is 34mm. For Nano, Small, Standard and Maxi, the tube entrance diameter is 39mm.


It is so exciting to get a new cobra chastity cage. However, please make sure you aren't partially aroused and make sure the penis flaccid completely when you take your measurements. You don't want to overestimate your true size.

Step 3. How to measure cobra chastity cage's ring - Cobra Rings Size

How to choose a right ring? It is one of the trickiest parts of chastity to find the perfect ring size.

These rings are measured by their diameter, which the distance from side to side through the center of a body. A right sized cock ring will fit suitably behind your testicles. Since the penis is round in shape, it is difficult to measure the diameter. Therefore, we recommend measuring the circumference, which the total distance around your penis. After you get the circumference of your penis, you can calculate the diameter of your cock. If you don't have a tape measure, you can wrap a piece of string or ribbon around your penis, then straighten it and use a ruler to record its length. The string can be easily wrapped around the cock just behind the testicles.

Once you have your circumference measurement, simply divide by Pi (about 3.14) to get the diameter. Here are some examples of this calculation with the common ring sizes. You don't need to worry about the ring size, because almost all our resin cobras contain 4 ring sizes.
Circumference behind testicles of 157mm (6.1 inches) ÷ 3.14 = cock ring diameter of 50mm (1.96 inches)
Circumference behind testicles of 141mm (5.5 inches) ÷ 3.14 = cock ring diameter of 45mm (1.77 inches)
Circumference behind testicles of 125mm (4.9 inches) ÷ 3.14 = cock ring diameter of 40mm (1.57 inches)

If at all possible, our advice is to choose your size based on previous experiences with chastity devices.

Ring Types:

We offer two types of ring, including 1.0 base standard(flat) Ring and 2.0 curved(arc)Ring. Please note that people with smaller balls can be more likely to slip through the gap of the curved rings. So maybe v1.0 base ring will more suitable for you.

Our base rings are measured by inner diameter.


We recommend starting with a base ring, unless you have experience with other devices and already know that you need a different type of ring.

For help with sizing, you can also email us at contact@cobrachastity.com