Ukulele: It looks like a guitar, but it's a smaller version. . But there are only four strings. In other words, there are four knobs on the piano head.

Photo of ukulele:

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/BBS/UploadFile/2008-6/20086 132227 1 10006 . jpg

Mandolin: Mandolin is generally not like a guitar, but I have seen mandolin made into a guitar. Features: 4 pairs of complex strings, * * * has 8 strings, and 20% of them are divided into 4 groups. In other words, there are eight knobs on the piano head.

Photos of mandolin:

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Photo of two musical instruments:

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