RAINY'S 2-TONE INDICATOR STRIPS: Don't lose sight of your fly again. Dual indicator strips allow you to tie on a strike indicator that gives you twice the chance of seeing your fly on the water! Aids in flotation. Recommended hook sizes: 2mm = 14 - 20, 4mm = 08 - 14, 6mm = 04 - 08. These come in these assorted color combinations: chartreuse/yellow, orange/chartreuse, orange/red.