Two grooved bearing rollers for DIY Japanese flying squid (Aori-ika) fishing using the Yaen method. The original holes were large, so they have been modified to be smaller, and a 1mm shaft fits well. They can be fixed with instant glue. They are made of stainless steel, but they will rust slightly. However, if you wash them with fresh water after each use, remove the water, and spin them, they will last a long time. They spin well if you apply oil. The original cost was high, so you may feel they are expensive, but if you use them, they will quickly reach the squid, so you should catch more, even if the squid are far away, large, or the bait is small.