OUR POLY YARN INDICATORS ARE MADE WITH THE HIGHEST QUALITY, MOST BUOYANT POLYPROPYLENE YARN AVAILABLE. LIKE OUR BIO-INDICATOR YARN, THEY COME PRE-TREATED WITH HIGH FLOATING WATERSHED TREATMENT TO MAXIMIZE FLOATATION. THE INDICATORS ATTACH EASILY TO THE LEADER BY USE OF SMALL RUBBER O-RING AND CAN BE EASILY REPOSITIONED WHEN NEEDED. POLY YARN INDICATORS ARE AT THEIR BEST WHEN FISHING LARGE, HEAVY NYMPHS IN FAST OR DEEP WATER. OUR POLY YARN INDICATORS ARE AVAILABLE IN 5 COLORS FOR VARYING LIGHT CONDITIONS AND EACH PACKAGE CONTAINS 4 INDICATORS. INSTRUCTIONS INCLUDED.