I fish beads once and a while using my center pin. If there are salmon present that are actively spawning, then I will try to match the hatch. Otherwise, I just treat beads as attractors. My selection is dependent on water conditions, and is similar to what I might select if I was drift fishing with corkies. My go to is an 8 mm bead that has been painted with a bright neon orange nail polish that I saw my wife wearing one day. It seems to work well on fresh run steelhead in coastal rivers. However, I usually use duller pink and orange colors on inland steelhead stocks (upper Columbia). Anyhow, that is just my 2 cents. Obviously, there are guys on this board who had a lot more experience fishing beads.