STRIKE INDICATORS, FINALLY PERFECTED Oros strike indicators enclose fastening hardware inside of two molded soft foam hemispheres. When closed, the foam hemispheres compress creating a pressure fit lock that keeps it on the line and in place, without kinking. Over-sized threads make securing it to the line effortless.To fasten: 1. Unscrew top 2. Place line in screw slot 3. Screw on top until the screw and nut grips the line 4. Unscrew ¼ turn to adjust up or down 5. Don't over-tighten. Indicator sizes: Small - 0.6 inches Medium - 0.80 inches Large - 1.0 inches Indicator weights: Small .019 oz - Medium .032 oz - Large .056 oz Recommended care: - Store loose indicators in a container or in a fabric pocket. - Foam may deform if indictor is compressed while stored.