If you are looking for S/M size, here is the converting attachment: Rends A10 Medusa Head Cup Insert S/M
This Rends Rends R-1 Controller with vibrating egg and A10 Cyclone is great for the couple play. The set includes the new improved version of Rends' Japan made R-1 controller with Bach Rotor along with their A10 Cyclone masturbation unit. Batteries are included to get you going right out of the box for a great experience.
R-1 Controller with Bach Rotor: R-1 Controller is high technology R-1 controller acting as power supply and operating panel , the attachments side can make the most of their great abilities. The included Bach Rotor can produce twice as strong as the other conventional rotor. The Bach Rotor can also express 50 different vibrating patterns by R-1.
Rends A10 cyclone masturbation unit: The revolving electrical masturbation hole “A10 Cyclone” is the first male product for the R-1 attachment series. Bring into reality the masturbation dream of every man to climax without ever having to move one's hand. Soft rubber interior wraps around and envelopes your penis. The same strong pleasure of intercourse or fellatio is experienced by the stimulating rubbing produced by the A10 Cyclone's inner rotation. A10 Cyclone was developed due to the overwhelming feedbacks of men who wanted “A tool that can bring me to climax at a touch of a button” With its powerful motor, even a big penis would not be able to stop A10 Cyclone's powerful rotations.