of modern metallic cartridges (i.e. 1860–1879), certain models of older black powder cap and ball revolvers could be used with multiple replaceable cylinders functioning as "speedloaders". It was however generally easier to simply buy a second revolver than to locate a cylinder alone, not to mention faster than swapping cylinders. As the reloading process for a cap and ball revolver was lengthy and time-consuming, carrying already-loaded cylinders with percussion caps placed on cylinder nipples was a considerable improvement in reloading time, although this is primarily a "trick" used by modern shooters who are used to having numerous shots available in short time with little work. When "spare cylinders" were carried, this practice was primarily done on Remington revolvers, as their cylinders were easily removable and were held by a cylinder pin, unlike the early Colt revolvers, which were held together by a wedge that went through the cylinder pin. The first revolver speedloader patented was that of William H. Bell in 1879. Moon clips and half moon clips Moon clips and half moon clips are special speedloaders for use with revolvers that chamber rimless cartridges, such as 9×19mm Parabellum or .45 ACP. Double-action revolvers are designed to use rimmed cartridges, and the extractors are incapable of removing rimless cartridges. Because of this fact, a different method of extraction must be used. Moon clips are a full circle, and hold a full cylinder of cartridges, while half moon clips are semicircles that hold half a cylinder full of cartridges. Speed strips Another variation of the speedloader for revolvers is the Speed Strip introduced by Bianchi International. Intended as an alternative to loose rounds in a pocket or dump pouch, it holds six cartridges in a re-usable Neoprene plastic strip. The strip operates by placing the cartridges one or two at a time into their respective chambers, and "breaking" the rounds off the strip into the chamber. Magazine loaders Loading a firearm magazine, particularly one with a large capacity and a corresponding high spring pressure pushing the rounds to the top of the magazine, can be quite difficult. A number of devices are available to make this task simpler, which are sometimes called speedloaders but are more commonly known as magazine loaders, stripper clips, spoons, or stripper clip guides. The simplest are inexpensive devices that depress the top round in the magazine, allowing the next round to be partially inserted with no