The Hanak ECO+ tungsten bead offers a direct correlation between diameter and weight, in a black nickel finish. Black nickel is ideal for dark nymphs and rigs where you want to maintain a low-glare metal head. Sizes range from 2.30 to 3.80 mm and from 0.11 to 0.39 g; packaging: 50 pieces per bag. In shallow water, start with the smaller sizes; increase the diameter and weight when the current or depth requires it.