6 and 8 mm beads are pegged on your line 1 1/2 inches above a size 6 octopus hook and drifted under an indicator or polish nymph style while fly fishing. They can be fished on a drift rig system while boat fishing with the water running. I have found the yellow colored ones work the best for browns. I also paint or highlight them with different fingernail polishes. TroutBeads.com carries quite the selection if Phil does not have what you are looking for, although I gave him a pretty big assortment that I had left over from guiding with them in Alaska.