Upper and collect nozzles are resin bonded products based on corundum, magnesium aluminate spinel, and graphite as main raw materials. The products have excellent thermal shock resistance, high-temperature strength, and good corrosion and erosion resistance. Well, blocks of corundum based, corundum-spinel based, and corundum-chrome based have excellent high-temperature properties, which can ensure long service life in use together with nozzles as part of the slide gate system.