Z cylindrical open feeder sleeves are made of high-quality thermal insulation refractory aggregates and appropriate amount of exothermic compound, which can meet the feeding needs of most steel castings and large castings

RND neck down riser sleeves are made of high-quality thermal insulation refractory aggregate and appropriate amount of exothermic compound, which can meet the feeding needs of most steel castings and large castings.

AND angel neck down riser sleeves are made of high-quality thermal insulation refractory aggregate and appropriate amount of exothermic compound, which can meet the feeding needs of most steel castings and large castings

V/Y special-shaped riser is made of high-quality heat-insulating refractory aggregate and appropriate amount of exothermic compound, which can meet the feeding needs of most disc type castings (eg: high-speed rail brake pads).