See-through Lined

The original SPT – and still the most popular. Included as part of the milker package. Designed to be used with a constant lube feed.  Perfect for long sessions.  Transparent when wet.  If you are only planning to have one SPT – this is the one!

Sizes: 30mm, 40mm (standard), 50mm. Scroll down for more sizing information.

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)