Thingamabobber fly-fishing strike indicators help you easily detect strikes. Fly-fishing strike indicators that cast easier, float higher, attach quicker, and stay in place and afloat! Thingamabobbers are super sensitive to detect the subtlest of strikes Super light. ¾" diameter ideal for short line, light line, and up to moderately heavy nymph rigs. 1" diameter ideal for heavy nymphs, big water. Revolutionary trapped-air technology. 9-piece assorted set includes three each of ½", ¾", and 1" indicators. Assorted colors.