The JN series of slag stopper is an alternative to traditional Slag Stopper Ball, using floating slag cone part and with a guide rod insertion device, and equipping with machinery to put in slag, thus improving the working environment, hit accuracy and the effect of slag, which strictly controls the amount of converter steel slag. The cone part uses pressure molding machine, guide rod casting, with high strength, good thermal shock resistance, but also has a unique non-stick tapping hole, the overall density adjustable range.