How to Make Ninja Spikes
- 1). Cut a piece of bendable cardboard into a strip that is 1 inch wide and about 7 inches long. Roll the cardboard together to create a half-inch tube. Secure with tape.
- 2). Coat the end a of black incense cone with a glue stick. Drop the cone into the tube, point end down. Gently press on the cone to secure it to the end of the tube.
- 3). Paint the entire tube black. Allow to dry for about an hour, then use as desired.