The Reins TG Slip Sinker Super Heavy Weight in Black features a design that gives you the ultimate performance with a specific gravity of 18.2. These sinkers are made with 95% tungsten and 5% nickel alloy. This makes them 1.8 times as dense as lead and environmentally safe. The shapes provide less hang ups on bottom structures with increased sensitivity which equals less drag on your line. Reins uses an inner core system to keep your line from being abraded.