It is a float for fishing.It consists of two parts, the main body and the flap.The main body has a hole with a diameter of 1 mm in the center, so you can pass the wire through it. Also, since it is a closed hollow space,Generates sufficient buoyancy (approximately 20 grams). The flap is made up of three blades. The bottom has a hole with a diameter of 1 mm and the diameter of 4.5 mm. The wire can be set on the bottom and the LED lighting and battery can be set on the top.If uncured resin remains in the hollow part of the main body during molding, open two small holes, remove the resin, and then cure the entire body to block the holes with an instant adhesive.Please enjoy fishing.