The Sea Striker Short Tail Sputnik Surf Sinker prevents your weight from moving in the surf. The stainless steel arms lock in place and anchor in the sand. When you are ready to retrieve, pull on the line and the arms snap open to allow for easy retrieval. Sputnik Surf Sinkers can actually increase the function of your rod by holding better with less weight than a pyramid sinker. This allows anglers to keep the lead weight lower vs traditional sinkers and stay within the casting weight range of your rod.