The Hanak Diamond+ tungsten bead directly correlates diameter and weight, and comes in black nickel. Black nickel is ideal for dark nymphs and rigs where you want to maintain a low-glare metal head. Sizes range from 2.50 to 4.00 mm and from 0.10 to 0.40 g; packaging: 20 pieces per bag. To maintain a slender profile, choose the smallest size compatible with the desired depth and increase the size only if the drift requires it.