Bought this chastity device back in April 2018 on Amazon and it has been my favorite device so far, tried many different chinese ones but always go back to this one. I chose the large size base ring of 5.7 cm wide and 4.1 cm tall. Inner diameter of 3.25 cm, and length of cage of 4 cm. (Think the image is of the small or medium base ring size.) I have never been able to escape from it without unlocking. The first few tries of putting this on, it took about 1-2 mins. Now I can always put it on in like 15-30 seconds. For me, it's comfortable and most of the time I don't notice its there until I start to get hard and strain on the bars of cage. It is pretty easy to clean myself without unlocking, and not really any problems peeing. Front opening of the cage.