... ,25mm,38mm,50mm, 76mm,90mm Material: SS304,SS316,SS316L,SS410 Metal pall ring is made of materials like carbon steel, stainless ... or Aluminum alloy, etc. The product has features such as thin wall, heat resistant, high free volume, high capacity, low resistance ... steel, stainless steel including 304, 304L, 410,316, 316L, SS410. Metal Pall Ring