Reins consist of leather straps or rope attached to the outer ends of a bit and extend to the rider's or driver's hands. Reins are the means by which a horse rider or driver communicates directional commands to the horse's head. Pulling on the reins can be used to steer or stop the horse. The sides of a horse's mouth are sensitive, so pulling on the reins pulls the bit, which then pulls the horse's head from side to side, which is how the horse is controlled.
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On some types of harnesses there might be supporting rings to carry the reins over the horse's back. When pairs of horses are used in drawing a wagon or coach it is usual for the outer side of each pair to be connected to reins and the inside of the bits connected by a short bridging strap or rope. The driver carries "four-in-hand" or "six-in-hand" being the number of reins connecting to the pairs of horses.
A rein may be attached to a halter to lead or guide the horse in a circle for training purposes or to lead a packhorse, but a simple lead rope is more often used for these purposes. A longe line is sometimes called a "longe rein," but it is actually a flat line about 30 feet (9.1 m) long, usually made of nylon or cotton web, about one inch wide, thus longer and wider than even a driving rein.
Horses should never be tied by the reins. Not only do they break easily, but, being attached to a bit in the horse's sensitive mouth, a great deal of pain can be inflicted if a bridled horse sets back against being tied
