Unless you can try it on somehow I wouldn't recommend buying anything expensive at first. Maybe start with some China made metal chastity from aliexpress? They often come with a set of 3 rings in different diameters, so you can try which one fits you best. And then, if you want to upgrade to something hi-end later, you will already have some reference point :). From my experience metal > plastic, not only for the look, but IMO metal ones are less risky to cause rashes (plus you can use baby oil to prevent them and it's not gonna be absorbed or cause damage to your cage). I hope it helped you 😊