Leather strips that help a rider control a horse
Tack is the equipment used to ride a horse and comprises of the saddle ... Bridle: 
the headgear used to control a horse's movement and direction ... leather strip 
that connects to the reins and girth that gives the rider control... [DOC] [TLE] Saddle & Tack Glossary - Lone Pine Film History Museum [PAR] CRUPPER: A leather strap that goes around an animal's tail to keep the saddle ... 
or ending in two rings through which the reins pass, to help control the horse.