The use of CMF Painted Brass Beads Orange 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