Your local hardware store should carry PVC pipe and they come in lengths of about 10 feet. Often times the store will cut the pipe for you, or you can use your own simple saw to cut the pipe into 1 or 1.5 foot lengths. (We recently purchased a "PVC pipe cutter" for about $8, but that's only practical if you think you'll be needing piping for other projects) Spray paint the pipe lengths red, following the directions on the product. Determine how many sticks of dynamite you need - then take a number of pipes and strap them together with the black electrical tape. You may want to tie the pipes with string or yarn so they are stable for you to tape together - or recruit a helper to hold the pipes while you tape them together. Attach some white sculpting clay on top of the pipes, around the middle of the bundle. Finally, take some electrical wire of different colors, if possible, cut short lengths of about 4-6 inches. Stick both ends of the wire in the clay, making loops of the wires. Take about 10-12 inches of red piece of wire and wrap it tightly around a rolling pin. This is creating a coil. Stick one end of the coil in the clay and the other end inside one of the hollow pipes. (It can be loose in the pipe because it's only for looks). This is a GREAT looking bomb that you spend only a couple of bucks on!.  "