Daiwa Bright Markers Yellow
Regular price $4.50
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The Daiwa "Bright" markers come as 20 meter spools. Since you only use a few inches at a time, a spool should last well over a year. This is by far the most cost effective solution for Japanese keiryu markers.
Keiyu anglers use a much thinner line than tenkara anglers, thin enough that even if it was hi-vis, you wouldn't be able to see it. To indicate strikes, they use "markers" that are placed on the line above the water's surface.