RIO's Tung Tied is for trout that are targeting baetis or PMD nymphs specifically. The mottled tungsten beads and thin bodies get the fly down quickly and look like the food the fish love. Tied on a barbless hook.

The following are the bead sizes per hook: 

Size 14 - 3.3 mm 

Size 16 - 2.8 mm

Size 18 - 2.3 mm 

Size 20 - 1.5 mm