These Fastach Sinkers are made from the environmentally friendly material tungsten and are very useful for adding extra weight to lures or to your rig. Tungsten is 1.7 times heavier than lead, making it much heavier in weight with a smaller volume. With the Fastach clip, you can attach or remove the weight with a simple flick of the wrist so you can quickly change between several weights and depths. Available in several sizes.