Quoting from their Website - "Zither Heaven, LLC is a U.S. manufacturer of quality wooden musical instruments for children and beginners. We use sustainable native North American hardwoods, along with other components manufactured in the U.S., to create great sounding musical instruments for kids and adults. Our current product offering includes thumb pianos, psalteries, banjos, ukuleles, harps, and Rock-it Sticks" 

Back to the Ukuleles and the ones they maker are either Soprano or Concert scale and a choice of a natural finish in cherry, maple or walnut, or a painted yellow, blue, red or pink. Then there are the all wood Tenor scale Banjoleles that come in black, red or natural (cherry) and used to come in Natural Walnut as well. On top of these two models, they have produced a 4 string "Mandolin" but its the same neck with nylon frets (so cant use steel strings), bridge and scale length as the Soprano so I guess its just how you tune it? All of the instruments started with zither style tuning pegs, hence the name, but since 2013 they have started to put standard friction tuners on some models.