Hand grenades are used by the infantry. There are three main types: one which gives a big powerful blast to destroy bunkers, another which starts fires and another which contains shrapnel to hurt enemy soldiers. Most grenades are shaped like an egg, with a metal-arm on its top and a ring. When the ring is pulled out, the arm flips up and ignites a fuse. The user then has a few seconds to throw it and take cover, usually about 5 seconds. It explodes on impact and may injure or even kill people.