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Construction

A classic sling is braided from non-elastic material. The traditional materials are flax, hemp or wool. Slings by Balearic islanders were said to be made from a rush. Flax and hemp resist rotting, but wool is softer and more comfortable. Polyester is often used for modern slings, because it does not rot or stretch and is soft and free of splinters.

Braided cords are used in preference to twisted rope, as a braid resists twisting when stretched. This improves accuracy.

The overall length of a sling can vary. A slinger may have slings of different lengths. A longer sling is used when greater range is required. A length of about 61 to 100 cm (2.0 to 3.3 ft) is typical.

At the centre of the sling, a cradle or pouch is constructed. This may be formed by making a wide braid from the same material as the cords or by inserting a piece of a different material such as leather. The cradle is typically diamond shaped (although some take the form of a net), and will fold around the projectile in use. Some cradles have a hole or slit that allows the material to wrap around the projectile slightly, thereby holding it more securely.

At the end of one cord (called the retention cord) a finger-loop is formed. At the end of the other cord (the release cord), it is a common practice to form a knot or a tab. The release cord will be held between finger and thumb to be released at just the right moment, and may have a complex braid to add bulk to the end. This makes the knot easier to hold, and the extra weight allows the loose end of a discharged sling to be recovered with a flick of the wrist.

Braided construction resists stretching, and therefore produces an accurate sling. Modern slings are begun by plaiting the cord for the finger loop in the centre of a double-length set of cords. The cords are then folded to form the finger-loop. The retained cord is then plaited away from the loop as a single cord up to the pocket. The pocket is then plaited, most simply as another pair of cords, or with flat braids or a woven net. The remainder of the sling, the released cord, is plaited as a single cord, and then finished with a knot or plaited tab.