Thank you for viewing. These are rollers for making Japanese "Yaen" fishing lures. There are 6 pieces. They have been tested in actual fishing conditions several times and work well. They roll smoothly. They are thicker than the rollers I have listed before. The hole diameter is 1.2mm, allowing a stainless steel rod to pass through. There are 23 colors available. Please specify your preferred color numbers after purchase. The quantity of each color can be mixed.