- Bottle caps of your choosing
- Duct tape
- big eraser
- Safety pins
- A knife
Step 2: First what you need to do is cut the eraser
First you will need to cut the eraser in to rectangles that will fit long ways in the cap. Make sure that when you put the eraser in the cap that it doesn't fall out.
Step 3: Attaching the pin
With the knife make a slanted cut in the eraser short ways, about 1/3 or less deep. put the side of the safety pin that doesn't open into the slit. Put a small amount of duct tape on top of the slit (make sure it covers the whole back).