The product as above photo shows is rubber bonded metal, which is used in fluid industry. The material is NBR bonded copper. Besides, there are many other choice depend on your need.
Jiacheng New Material (SJK) will vulcanize rubber with metal together adhesive. Compared to those rubber seal stick to metal simply with a glue, rubber bonded metal has much stronger adhesive force, and can’t be separate easily.
Materials of metal can be iron, stainless steel,aluminium, etc.Rubber part has choices of FKM, NBR, EPDM, Silicone, etc.