Strings (tennis) be more durable than many other types of strings due to its outstanding tension retention. This may help to offset the high initial cost. The use of a dense string pattern also generally improves the longevity of natural gut. Natural gut is produced by drying fibers extracted from a part of the cow intestine called the serous membrane, or serosa, which contains collagen designed to withstand the stretching and contraction of the intestine. It is this elasticity that makes the fibers useful for tennis string. Sheep intestines have also been used for racquet strings in the past. The first natural
Music history of the United States during the colonial era on the State of Virginia", which refers to it as a "banjar", and notes that the instrument came from Africa. Other names included "bangoe", "banshaw", "bangelo", "banza", "bangil" and "banjer". The instrument was described in West Africa as early as 1620 by Richard Jobson, but was present for some time before. In North America, the banjo was typically made by hollowing out a gourd or calabash and attaching a long neck. The slaves then stretched a piece of animal hide, usually raccoon, over the bowl and attached four strings. Jefferson claimed that the "banjar" with which he was familiar was