Falconry training and technique two parts that twist freely, each with a metal hoop on the end. The swivel may be traditional, or modified. The modified swivel has much larger metal hoops than the traditional. While swivels have been made of cloth or other materials in the past, most modern falconers use metal swivels. See Falconer's knot for more information about tying off the bird to the glove. When using Aylmeri jesses, there are usually two sets of straps: the mews straps, for manning and tethering the bird, and flying straps. The flying straps are lighter and smaller for hunting; the mews straps are
Space tether generated across a conductive tether by its motion through the earth's magnetic field. The choice of the metal conductor to be used in an electrodynamic tether is determined by a variety of factors. Primary factors usually include high electrical conductivity and low density. Secondary factors, depending on the application, include cost, strength, and melting point. An electrodynamic tether was profiled in the documentary film "Orphans of Apollo" as technology that was to be used to keep the Russian space station "Mir" in orbit. This is the use of a (typically) non-conductive tether to connect multiple spacecraft. A proposed 2011 experiment