to the theoretically uninterrupted transfer of vibrations to the angler's hand, and are preferred by many. However, the difficulty in transporting one-piece rod safely becomes an increasing problem with increasing rod length. Two-piece rods, joined by a ferrule, are very common, and if well engineered (especially with tubular glass or carbon fibre rods), sacrifice very little in the way of natural feel. Some fishermen do feel a difference in sensitivity with two-piece rods, but most do not. Some rods are joined through a metal "bus". These add mass to the rod which helps in setting the hook and help activating the rod from tip to butt when casting, resulting in a better casting experience. Some anglers experience this kind of fitting as superior to a one piece rod. They are found on specialized hand-built rods. Apart from adding the correct mass, depending on the kind of rod, this fitting also is the strongest known fitting, but also the most expensive one. For that reason they are almost never to be found on commercial fishing rods. Types Fishing rods can be constructed out of a vast number of materials. Generally they are made with either fiberglass, graphite, or a new generation composite, also known as carbon fibre. Many times carbon fibre and graphite are used together in the rod making process. Carbon fibre rods A carbon fibre rod is not necessarily better than a glass fibre rod; the two fibres have different properties, with their own tradeoffs. Carbon fibre is less flexible (stiffer) than glass fibre and more brittle and prone to breakage when misused, while carbon fibre allows for longer and faster rods. Carbon fibre also allows for a smaller diameter rod that is more sensitive than a glass fibre rod. A carbon fibre rod is also much lighter than a glass fibre rod allowing for longer days of fishing. Each has its purpose in the fishing industry and both improve an anglers chances of being successful when the blanks are used for the right purposes. Fly rods Fly rods, thin, flexible fishing rods designed to cast an artificial fly, usually consisting of a hook tied with fur, feathers, foam, or other lightweight material. More modern flies are also tied with synthetic materials. Originally made of yew, green heart, and later split bamboo (Tonkin cane), most modern fly rods are constructed from man-made composite materials, including fibreglass, carbon/graphite, or graphite/boron