The rings are quite different and all have their advantages and disadvantages. The bigger rings with many spikes are, contrary to intuition, rather less painful, because the pressure is distributed more. With the narrower model, the advantage is that much cock stands out, so you can stimulate it a lot and even ride it.
The model for the glans is very mean and painful, but can easily go open because the clasp is only hooked. The ring of black plastic is a wonderful invention because the slave can not take it off. Thus, it can also be worn during the day.
When using the rings, Yara attaches great importance to the fact that the pain is caused by the ring and thus the own horniness. Therefore, she stimulates the dick so that the ring does not move back and forth, but only the dick swells.