The so-called standard products are those products with highly standardized attributes. The characteristic of this product is that there is no difference between peers. In fact, non-standard products can be summarized in one sentence, except for standard products, all are non-standard. The most typical representatives are: clothing, ornaments, household items, rice, grain and oil, and labor insurance supplies. Sometimes the boundaries are not so clear. It is common for you to have me and me to have you.

Beauty contact lens is a kind of colored contact lens, which can change the color of eyes and enlarge pupils when worn on the cornea. The colors of cosmetic contact lenses are black, brown, gray, blue, green and purple. Each color has different effects and can meet the different needs of different consumers. For example, black makes eyes bright and watery, brown makes eyes more beautiful and so on.