The rubber O-ring of our Poly Ring Strike Indicators provides quick and easy loop-type attachment to secure the indicator to your leader. Quick change adjustment as well. Use the Standard Poly Ring for normal fishing or in heavier water. The rubber O-ring of our Poly Ring Strike Indicators provides quick and easy loop-type attachment to secure the indicator to your leader. Quick change adjustment as well. Use the Mini Poly Ring Indicators for detecting subtle strikesimage