they are poor quality

Counterfeit products are often sold at high prices in order to seem genuine, but in reality they are poor quality, imitation products.
Los productos falsificados a menudo se venden a precios elevados para parecer genuinos, pero en realidad son productos de imitación de baja calidad.
Don't buy those crayons. They are poor quality, and they are not worth their price.
No compres esos lápices de colores. Son malos, y no valen lo que cuestan.
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