Yiwu couplet wholesale market. Happy couplets belong to wedding supplies, which are sold in shops operating the products and in Yiwu couplets wholesale market in Suzhou. Their business scope includes wedding supplies, couplets and so on. Couplets, one of the traditional cultures in China, also called couplets or couplets, are antithetical sentences written on paper, cloth or engraved on bamboo, wood and columns.