Precision balance is the key to, erratic action, and Lunker City Insert Weights -- often called "nail weights" -- are the key to maintaining that balance while adding weight to reach deeper into the fish's world or tune the lure's action to specific conditions. 2 sizes of Insert WeightRibbed design ensures that the weight will stay right where you put it, and they are soft enough to be trimmed to size with any line clipper. Internal weighting allows the angler to balance his lure to achieve a specific result. If the desire is simply to make a bait work a little deeper, or to offset the effect of a breeze, placing the weight near the center of the lure -- just behind the hook -- works best. Inserting the weight at the tail of the lure causes it to sink tail first. Tail down also means nose up, so when you twitch a tail weighted bait it's easy to make it jump out of the water and skip across the surface like a terror-stricken baitfish.