One of these crops is domestically produced and the other is imported.

The domestically produced Dielianhua linen thread was registered and produced by Shanghai Meizheng Yarn Factory in 1949. It uses butterflies and flowers as its trademarks, which means "Dielianhua". This kind of thread is made of flax fiber and has the advantages of good hygroscopicity, good breathability and good elasticity. The imported Dielianhua linen thread comes from Italy and is made of top-grade flax fiber originating in Italy, with better quality.