If you are just happening to be in the market for a ukulele that is better than an entry level uke but will not burn a whole right through your wallet. This is as seen above the 

            Lanikai LU-21C Concert Ukulele.

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If you have any questions to do with any instrument let me know!

Concert Ukuleles have four nylon strings. Tenor have three nylon strings along with a copper wrapped string. Now on my concert uke I use tenor strings. It gives it a little bit more of a warm sound. 

Links:

Ukulele: 

http://backstage.musiciansfriend.com/Folk-Traditional-Instruments/Folk-Traditional-Stringed-Instruments/Ukuleles/LU-21C-Concert-Ukulele-Rosewood-Fretboard.site1sku512521000000069.sku

Ukulele Strings: http://backstage.musiciansfriend.com/Accessories/Strings/Ukulele-Strings/J71-Pro-Arte-Tenor-Ukulele-Strings.site1sku101683000000000.sku