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A curved, rod-shaped, surgical steel medical device. This device is used in abortion clinics, though I'm not sure of the specifics.

My area of knowledge surrounds the use of urethral dilators by men for masturbation or medical play. These metal instruments (also known in the scene as "sounds") are inserted into the opening at the head of the penis. They come in different sizes, from approximately 3mm to about 18mm in thickness, though the length is usually 12 inches.

Some can be heated or cooled for additional sensation.