The use of CMF Metal Colour Brass Beads Matt Black with Caddis, Streamer, Nymph and wet flies when you would like the flies to sink but not very fast almost like insect that is diving in the water, you can use CMF Brass Beads they are available in Metal Finish (Gold, Silver, Black Nickle, and Copper) Painted finish (Orange, Red, Pearl White, and Olive) Anodized finish (Olive Gold and Blue) The Anodized and Painted beads is 25 beads per pack and the Metal colours is 50 beads per pack. Here is a direct link https://www.cmffly.co.za/cmf-fly-tying-beads/ CMF Tungsten Beads is available in size 1,5 mm up to 3,8 mm

 

Bead size to hook

• Hook size #6-#8 you can fit bead 3.8mm to 4.2 mm
• Hook size #8-#10  you can fit bead 3.2mm to 3.8 mm
• Hook size #10-#12 you can fit bead 2.7mm to 3.2 mm
• Hook size #12-#14 you can fit bead 2.4mm to 2.7mm
• Hook size #14-#16  you can fit bead 2.0mm to 2.4mm
• Hook size #16-#18 you can fit bead 1.5mm to 2.0mm