This is a review for the A275, A275-1 and The Arc, model which all are interchangeable names for the same item found on eBay, Amazon, and DHgate. This product came in a clear plastic bag which included the base ring and tube assembled with the lock, two keys and a urethral tube uninstalled (as it is optional). I disassembled and cleaned the whole product .which is made of 304 stainless steel with a sponge and dish washing soap. It was quite dirty and has some rough, non polished inside surfaces which will need to be wet sanded with 400 grit/1000 grit sandpaper. for a better finish. I did not wash the lock, however I did apply graphite and work the key in, out and twist. I then put it on to test for fit. The device comes with only one base ring. You select from three sizes when ordering 40mm, 45mm, and 50 mm in a drop down box. I ordered the 45mm based on my simple measurement in diameter with a tape measure and converted to inches. This item comes with an anatomically curved base ring which I found quite simple to put on once flaccid and very, very comfortable. I placed each testicle through one at a time then compressed my penis and manipulated it through the base ring with almost no issues. Next I attempted to place my glans in the 33 mm shaft tube. This proved more difficult than I expected as I apparently have good girth in my penis. Over time I managed to shrink enough to force things into place. There are two metal guide pins which slide into holes in the base ring before the locking mechanism can be engaged. There was a minor amount of pinching since I used no lubricant and I was still quite swolen. After installation I managed to remove the shaft cage just enough to push more shaft skin into it which helped tremendously. I attempted a sit and pee which worked out pretty good over all. There is a lot more pressure than I am used to with no cage, perhaps that will change over time as I become more relaxed in the devices wear. Over all impression - Its very comfortable, much smaller than I though (or perhaps I'm bigger), and I'm not sure that I will ever use the urethral insert. Good to have though. There is still a lot of skin making contact with my underwear offering more stimulation than I thought there would be. The packaging is fine. I don't get the draw to having a box or bag that you are just going to throw away. My cost was $18.99 for a Chinese device shipped from New York to my home in three days. I might order the bigger one. but I do like how small the profile is on this one. I also might still order a plastic Holy Trainer Knock off so that I can have less stimulation. They do make a smaller model with spiked anti erection/pullout device. I also think that the anti erection device can be purchased separately. You can also order a bigger or smaller ring separately. I'll post pictures later.