This item was created by me using a 3D printer and handcrafting. It has been used successfully in actual fishing. It was created for those who want to prioritize long-distance casting over the capacity of the chum container. The main body of the plastic (PLA) is 3D printed, and the stainless steel eye and the spring for opening and closing the cage are handmade. Images 1-3: The cage is designed to open simultaneously upon water entry. It is designed to open as easily as possible within a range that does not interfere with fishing, so that you don't waste time with the cage not opening. Also, the spring is designed not to bounce up more than necessary to prevent the leader from tangling. See images 4-5: There is a screw-on lid on the bottom cage, and you can put a weight of your choice inside. Weights of a certain size can be inserted directly. I put a size 12 nasu-shaped weight directly inside. Weights that don't fit can be made to fit by shaping them with a hammer without having to melt them down. The weight of the item itself is about 40g. You can see that it is a standard size if you look at the comparison image with a commercially available Apollo Ippatsu Kago. Please understand that there may be individual differences as this is handmade. The Apollo Ippatsu Kago is not included.