First off let’s start that off the shelf manufactured devices are almost never a perfect fit. Chastity devices are more or less uncomfortable and not something you will forget is there. They are not orgasm proof, orgasm resistant at best. You will be able to pull out the back of them. If you are looking to buy a non custom device that fits perfectly, is never uncomfortable, orgasm proof, that you can’t pull out the back of, that you can instantly wear for lengths of time...you will be disappointed. That being said you can still find a device that you can wear, fits pretty well, will prevent erections, and keep you from playing with yourself unless you are really trying. I am going to concentrate on steel cages. I believe most gravitate towards them anyway, and hygiene, comfort, and security are all just a tad better with steel. Some can’t use them due to travel and metal detectors. I respect that, but I still think their are ways around it, even explaining to the security that you have body jewelry there. Plus I just haven’t owned more than one cage that wasn’t steel and it was a silicone terrible device. So for my thread it’s all about steel. Cage length 1. What’s your flacid size? Not the half chubby size, not I gotta pee size, but your sitting down in ice water size. That is the ideal cage length. 2. Are you cut? I am, so cannot say for sure about end of device stuff, but am pretty sure a closed end is better for the uncut penis. 3. They in general come in 3 different sizes:28mm, 35mm, 52 mm. I am one inch flacid and wore the 52, it was too long. The 28mm is a bit scrunched but was very comfortable, except I peed all over my sack. 35 was just about right(I didn’t like the lock though will explain later). Cage diameter 1. Get one that allows it to move around and chub up in there. This makes cleaning easier, and skin won’t be constantly folding on itself, hiding moisture, or trapping it between it and the device. 2. Most cheap cages do not offer any different sizes in diameter, don’t worry, I think it’s the least important dimension. Base ring 1. They are usually offered in 3 different sizes: 50mm, 45mm, and 40mm. 2. I suggest getting two. The 50 and the 45. They are very cheap devices20-30 dollars. Buy two and if the one doesn’t fit the other will. Most would have to work at wearing a 40(so used to wearing it that your sack adjusts) so that is normally off the menu right off the bat. Gap This is not really an option on the cheap devices, but know that the bigger the base ring, the more room there is for your sack. Lock I am a sucker for the integrated lock. 1. It is very easy to use, and more importantly, it is easy for her to use. She doesn’t want to be fiddling with screws or lining up a padlock. 2. Padlocks usually use a post. A post will turn if there is any play between the lock and the post. Any turning will allow balls to slip out...bad. 3. Padlocks are pointy, bulky, and noisy. Self customization Small things you can do to make your cheap device way more comfy. Nothing too difficult that someone with a basic set of tools couldn’t handle. 1. Buffing. Some of the cheap devices may have tiny rough spots. You can take a dremel with a buffing disc and take care of those. 2. Bar adjustment. Some cages have two vertical bars on the end. I have found they are not spaced close enough together to keep your penis from slightly pushing through the gap when excited. Take a sock and a pliers and gently bend the bars closer together. Things to avoid. 1. Hinged rings, the small gap of the hinge will catch your ball skin. 2. Sharp edges. Everything should have rounded edges. Things to know. 1. You are not as big as you think you are. As far as cage length goes, when in doubt, go smaller. 2. You may think you need room for it to grow a lil...you don’t. If you let it start to get erect, quickly it will fill and get painful. 3. A loose fitting base ring will hang low on your sack, and when excited, will pull down on your sack. Plus it still won’t stop erection. It will build behind the base ring. So as small and close to the body a base ring u can wear. So this should be enough for someone to get an idea of how to get their first cage, and what to look for.