Those chastity cages are old models and not that great. You really wanna go for a Cobra design with all the holes so your skin can breathe, otherwise that thing needs to be taken off constantly and smell really bad from all the sweat and oil collecting in there. The best one would be the cage the pink haired girl offers, assuming you are pretty small down there already, because that design is still used more commonly. What you really don't want is the black haired girl's cage, because any cage with an unbuilt catheter will give you a urinary tract infection. The worst ones of that kind are those with the plastic catheter because you can't even disinfect those properly, anything hot enough to do it would damage the plastic. But having a rigid metal catheter in your penis all day would likely get you infected as well, plus all the chances for irritating the sensitive tissue inside.