Rainsticks come in many different shapes and sizes. I have 3 different ones that are different in length, sound and weight. Many rainsticks are made from cactus. Nails, cactus spines or pegs are affixed to the insideof the rainstick, then pebbles, beans, seeds or other small items are added. When the rainsticks is gently tilted, the pebbles or other small items fall past the pegs and create a rushing sound like rain.
Rainsticks are a terrific instruments to use when you would like to work on objectives such as motor coordination, and motor control. The smaller the rainstick, the easier it is to control and to create a consistent "rain" sound. Longer rainsticks are heavier and harder to control, but can provide a longer "rain" sound with good control.