Chastity device reviews discussion

Hello pals, I keep my boyfriend David in constant chastity and orgasm denial using various devices. I believe the most effective one so far is the CB6000s. I enjoy teasing him for hours without letting him cum, then lock this compact device on and watch him toss and turn all night while his hands are secured in bondage mitts. He goes CRAZY trying to find some satisfaction but has never succeeded even once. I like placing him in different devices and have found that several Chinese models work quite well, but I want to purchase one immediately. The options require a ring size choice starting at 40 mm and going up to 52 mm. My question is which should I pick? Although he is large, very muscular and overweight, he lacks significant endowment. That’s why I usually keep him in the 6000S model. With the regular CB6000, there is too much empty space. When erect—which happens rarely—he reaches a decent size; if I dangle my sweaty feet under his nose, his cock grows impressively. But when not aroused, it looks rather sad. I’m unsure if that relates to ring size or not, but I do want to buy this very inexpensive device just to test it out without letting his balls slip right out either. This is the device Any advice would be greatly appreciated. I want David to experience all sorts of different chastity devices and ultimately a permanent Lori’s Tube when I sentence him into permanent denial. But first things first! Thank you again for your help, Mistress Keena