The tunnel of the A10 Cyclone Insert: Snake Pressure Cup has a "snake" bend in the middle. This creates a very strong pressure zone of stimulation that rotates around your member. The tunnel itself is also very narrow creating a very tight feeling around the head. The entrance has a diameter of 0.5 inches which may be too tight for some individuals so please make sure this insert will work for you.
This is the separate insert for A10 Cyclone.
*Rends' R-1 Controller and A10 Cyclone attachment is needed for this product to operate (sold separately).