A stirrup is a light frame or ring that holds the foot of a rider, attached to the saddle by a strap, often called a stirrup leather. Stirrups are usually paired and are used to aid in mounting and as a support while using a riding horse or other equine. Stirrups used on English saddles are usually made of metal. Though called "irons," they are no longer made of iron, as a rule, but instead stainless steel is the metal of choice, due to its strength, though when weight is an issue, such as for a jockey, they may also be made of aluminum. Inexpensive stirrups may be made of nickel, which can easily bend or break and should be avoided. Stirrups may also be made of synthetic materials and various metallic alloys. There are many variations on the standard stirrup design, most claiming to either be safer in the event of a fall or to make it easier for a rider to maintain a proper foot and leg position.