Damroo drum. Also known as a monkey drum or talking drum. You just hold in it and twist your wrist, like you are shaking up a can of soda. The knots at the end of the string to beat the two ends of the drum. Great sound, lots of fun. Sizes vary from 5 to 6.25 inches tall and from 3.25 to 5.75 inches wide. Colors may vary.