Stainless steel composite pipe: material for iron pipe, outside wrapped with stainless steel layer, relatively strong, pipe mouth closed good case can guarantee its rust-proof period and pure stainless steel is no different. Stainless Steel tube: The entire tube for the stainless steel lighter, load-bearing capacity does not have a composite tube, but not easy to rust, stainless steel material and several kinds of 200,201,300,301,304, the market is generally 301 materials, 304 of the best effect, followed by 301.