These are rollers for making Japanese squid lures (yaen), for DIY use. There are 20 pieces. They have been tested in actual fishing conditions several times. They roll very well. This is the thicker type of the two types of rollers I am selling. The hole diameter is 1.2mm, and a stainless steel rod fits perfectly, allowing for smooth rotation. A 1.0mm shaft also rotates well enough. There are 22 colors available. Please specify your preferred color numbers after purchase. The quantity of each color can be mixed.