A boilie, for example, is basically a scented cornmeal or flour-based mixture with eggs and a flavor additive. This pasty dough is then rolled into bait-size balls that are boiled for one to two minutes, which gives the boilie a firm outer core. It is then strung onto a hair-rig. Originally, hair-rigs utilized a length of human hair to attach the boilie to the hook. Modern rigs are tied with any thin hook-length material, but the principle is the same--the bait sits away from the hook, and therefore goes undetected by the sometimes mouth-sensitive fish.