The sling is made of a thin strip of polypropylene mesh weave, a common and safe type of mesh used for surgery in a variety of body locations. The width is 1 cm and the length left in the body is usually between 6-8 inches long. There are various methods for placing slings, but ultimately, it must rest under the mid-urethra.
Durability is important and most (85%) will still be dry in the long term. There is an expected drop off (recurrence) rate which is inevitable given changes that occur to the body with age, menopause, weight loss or gain, etc. Women who are still considering another pregnancy should not undergo a sling till childbearing is complete.
Slings will usually work right away even though most scarring isn’t complete for several months. In the first several weeks, occasionally the stream may seem a little slower than usual, or may split or deflect. These usually self correct after a few weeks.