TetherSpout Device is desiged for someone who has chastity requirement but non-piercing.It can be used separately or used with cage.
Typically, when use tetherspout alone, a shorter device is required, and when use it with a cage, a longer device is required. Since there are two shaft tubes in 1 set, if you have different usage requirements, you can request that the two shaft tubes be different length. But this is an advanced requirement, and you have to try an existing piece of equipment to get a feel for what proper length of shaft tube you would need.
Here are the two sizing Sounds/dilators that are available.
To figure out which sound/dilator is best for you, try this suggestion: measure the vertical length of your slit while flaccid and without stretching it (the outside is elastic, unlike the inelastic part further inside). If it is at least 14mm (0.55") in length, get the 10.5mm-15mm sound. Otherwise, get the thinner 5.5mm-10mm sound.
But it is always better to get both sizing sounds.
Here are 3 existing combinations of TetherSpout.(stainless steel version)
barrel diameter 6mm
flange diameter 8mm
2 retaining rings' diameters 9mm and 10mm
barrel diameter 7mm
flange diameter 9mm
2 retaining rings' diameters 11mm and 12mm
barrel diameter 8mm
flange diameter 10mm
2 retaining rings' diameters 12mm and 13mm
custom size is available,and upgrade material to be titanium is also available.