Stærð : 9 x 6,3 x 7 cm The NINO® Percussion Wood Frog Güiro is hollow inside with a ribbed back that creates a "ribbit" sound when you drag the scraper over it. The look of the instrument makes it fun to play for children. It produces a warm, mellow tone that blends with other instruments in a classroom setting, or children can enjoy playing it around the house. Includes wooden scraper.