They are about £55, you will need a brush that has had the socket taken off of the back and it comes with it's own jets that screw through the brush and fix to the gooseneck. They are made by a firm in the UK and are aluminium, they weigh about 300g. They come in two sizes 22m or 23mm to fit different pole sizes. They bond on to the end of a pole and have the hose exiting at the base of the fitting and then it can be taped to the gooseneck to connect to the brush jets.