Bi-Polar Electro Lined SPT

This new SPT is fully lined with smooth conductive rubber, and designed to be used with a constant lube feed. The combination of wet pulsating rubber suction and electro stimulation is remarkable! Perfect for long sensuous E-stim sessions. The SPT is bi-polar so does not require additional contacts. It can be used mono-polar if required - just choose one of the electrodes. The SPT is fitted with 4mm banana sockets for easy connection (cable not included). Sizing: Sizes 30mm, 40mm, 50mm. The size refers to the internal diameter of the SPT. 40mm is by far the standard size. Due to the way the milker works the sizes are not that critical - as long as the penis will fit inside the acrylic tube when erect. Diameter is calculated by dividing the circumference by π (3.142).