for ukuleles is a type of acacia endemic to Hawaii, called koa. Typically, ukuleles have a figure-eight body shape similar to that of a small acoustic guitar. They are also often seen in nonstandard shapes, such as cutaway and oval, usually called a "pineapple" ukulele (see image below), invented by the Kamaka Ukulele company, or a boat-paddle shape, and occasionally a square shape, often made out of an old wooden cigar box. These instruments usually have four strings; some strings may be paired in courses, giving the instrument a total of six or eight strings (primarily for greater strumming volume.) The strings themselves were originally made of catgut. Modern ukuleles use strings made from nylon polymers, synthetic gut, or fluorocarbon or wound strings composed of a (typically) nylon core wound with metal or polymers, including aluminium and silver-plated copper. Instruments with six or eight strings in four courses are often called taropatches, or taropatch ukuleles. They were once common in a concert size, but now the tenor size is more common for six-string taropatch ukuleles. The six-string, four-course version, has two single and two double courses, and is sometimes called a lili'u, though this name also applies to the eight-string version. Eight-string baritone taropatches exist, and, 5-string tenors have also been made. Types and sizes Common types of ukuleles include soprano (standard ukulele), concert, tenor, and baritone. Less common are the sopranino (also called piccolo, bambino, or "pocket uke"), bass, and contrabass ukuleles. Other types of ukuleles include banjo ukuleles and electric ukuleles. Of the standard ukuleles, the soprano, often called "standard" in Hawaii, is the second-smallest and was the original size. The concert size was developed in the 1920s as an enhanced soprano, slightly larger and louder with a deeper tone. Shortly thereafter, the tenor was created, having more volume and deeper bass tone. The baritone (resembling a smaller tenor guitar) was created in the 1940s, and the contrabass and bass are recent innovations (2010 and 2014, respectively). The following chart shows the range of notes of standard ukulele types. Note that range varies with the tuning and size of the instruments. The examples shown in the chart reflect the range of each instrument from the lowest standard tuning, to the highest fret in the highest standard tuning. Additionally, the contrabass below aligns with the bass in the above table. Tuning One of the most common tunings for the