The Oros Strike Indicators' design makes so much sense they have become an industry-acclaimed and award-winning fly fishing strike indicator in a very short time. Oros Strike Indicators eliminate common indicator pain points with no small parts to fumble and lose, do not kink the line, and are easy to adjust. The round strike indicator unscrews in half to reveal a centered slot for your leader. Merely align your leader in the slot and screw the two Oros halves together until they grip the line. The centered alignment on the fly leader enables balanced casting without exposed fastening hardware or posts that stick out and can create drag or tangle lines.