Musical blocks help with personal development. Sensory play with these fun, wooden blocks can assist with language development, problem solving and motor skills. A colored musical note only appears on one side of the prisms so they can be turned upside-down to test discriminatory skills. This set comprises 12 hardwood triangular prisms with 6 pairs identifiable by matching, colored musical notes and a unique sound when shaken. Details:Natural brown color2" x 2.4" x 2.4" (5.08cm x 6.1cm x 6.1cm) prism sizeSet of 12 prismsHelp children develop their listening skillsConstructed with hardwoodCan be used indoors or outdoorsFor ages 18 months and up