Step 2 : Making the inside of your rain stick
Take the cardboard roll. You have the option of piercing it with toothpicks, or inserting some pipe cleaners in the form of a spiral or to form a spiral with foil and insert one of these into the roll. These will help slow the path of rice or dry beans, to create the sound of rain.
Then close one of the openings of the cardboard roll with a piece of wax paper that has been cut into a circle. Secure it with tape. Turn the cardboard roll over and pour the rice or legumes into the rain stick using a funnel. Then close the other end of the rain stick with another piece of waxed paper that has been cut into a circle, just like the other end.
Test the sound of your rain stick, and modify the toothpicks / pipe cleaners or the amount of rice / legumes until you really like the sound.