The function of fishing sinker weight is to increase the casting distance and fix it in a certain depth of fishing area by the casting power of Angler. Fishing sinker can be as small as 1/32oz for shallow water, even smaller for fly fishing, or as large as a dozen ounces for deep-sea fishing. Fishing sinker comes in a variety of shapes. To reduce water resistance and the noise of entering the water, the fishing sinker is usually sharp at both ends and large in the middle. Most fishing sinkers are made of lead, but in recent years, tungsten has been used to make fishing sinkers because of it is high density, small size, and environmental friendliness, which have gradually replaced lead pendants as environmental protection has become more and more important.