Jaydacators are the ultimate in Strike Indicators. Designed and hand made in Truckee California by long time local guide and fly fishing Rockstar, Jason Cockrum. These Indicators are bullet proof and last forever. . The Jaydacator is easy to adjust, tells the direction of your flies in the water and very sensitive to strikes. when guides have a day on the water this is the indicator they use. We have them in two sizes. Medium is the most popular and versatile. The medium can hold up pretty heavy flies and is more sensitive to fish grabs. The large is only needed for very heavy flies like size 4 Balanced Minnows or if it is a super choppy day on the lake and you want a little more buoyancy.