Thank you for viewing. These are rollers for making Yaen (a type of fishing lure), for DIY use. There are 6 pieces. They have been tested in actual fishing several times. They roll very well. They are thicker than the rollers I have listed before. A 1.2mm stainless steel rod can pass through the hole. There are 23 colors available. Please specify your preferred number after purchase. The quantities can be mixed.