Many anglers using sinking flies with a marker (float) have likely experienced bites where the marker twitches, but you couldn't hook the fish, haven't you? The biggest advantage of this "Shimori-Uki" system is that it floats at the very edge, almost regardless of the fly's weight. If a fish bites, with a conventional marker, any resistance or unusual feeling will cause the fish to spit out the fly. With this Shimori-Uki, fish can bite without any resistance and sink the Shimori-Uki. Detecting bites is clear, and hooking misses are dramatically reduced. It is particularly effective in pond-style stocked fishing areas. [Catch Report] December 18, 2025, Pond-style stocked fishing area with a large stocking Weather: Sunny, Temperature: 5-13℃, Water Temperature: 10℃ With conventional markers, the hook-up rate was a poor 20-50% due to wary fish, and catching 10 fish was considered satisfactory. However, on this day, the hook-up rate was an astonishing nearly 80%, resulting in a great catch of 29 large fish, which is exceptional for this pond. [Precautions] The Shimori-dama (bead) is made of styrofoam, so while it has strong buoyancy, it is fragile. Please do not pull or crush it forcefully. Shimori-Uki Fly Fishing Marker Indicator