Guitalele - 6 String Guitar/Ukulele by Yamaha. The Yamaha GL1 is a quarter size hybrid guitar - ukulele. It feels just like a guitar and plays just like a normal size guitar. It has 6 nylon strings and is tuned in the same way yet its tone and size are the same as a ukulele. It features a spruce top with mahogany back and sides and measures just 45cm with a 17inch scale length and 18 frets.