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Most urethral chastity cages use one of two types of inserts. Stainless sounding tubes are rigid and fixed in shape, creating a precise and stable internal alignment. Silicone catheters, by contrast, are softer and more adaptable, with lengths that can be adjusted to suit individual preferences. These two approaches reflect different design philosophies rather than levels of intensity.
For many wearers, the appeal of a urethral design is not about novelty, but about presence. The internal element creates a constant point of awareness that doesn’t fade into the background. It establishes a clearer sense of boundary and exclusion, and for some, that internal presence feels more grounding and more psychologically reinforcing than external restraint alone.