Two grooved bearing rollers for DIY using in Japanese spear fishing for spear squid (Aori-ika). The original hole was large, so it has been processed to be smaller, and a 1mm shaft fits well. It can be fixed with instant glue. Although it is made of stainless steel, it will rust slightly. However, if you wash it with fresh water after each use, remove the moisture, and spin it, it will last forever. It spins well if you apply oil. The original cost is high, so you may feel it is expensive, but if you cast it, it will reach the squid quickly, so you will catch more, even if it's far away, even if it's large, and even if the bait is small.