Folk Gusli have from eleven to thirty-six gut or metal strings, tuned diatonically. There were two main forms: helmet-shaped (Shlemovidnye gusli) and wing-shaped (Krylovidnye gusli): Shlemovidnye gusli is a variety of Gusli held by the musician on his knees, so that the strings are horizontal, the resonator body under them. Krylovidnye gusli is much smaller, and has more resemblance to Baltic psaltery such as the kankles, kokles, kannel and kantele. They are held much more like modern guitars.