What are the six requisite specifications for validating a contract of forward sale (Salam) concerning textiles?

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The validity of a forward sale contract for textiles is established by specifying six characteristics: the type of material, such as linen or cotton; the place of origin; the length; the width; the thickness or thinness (safaqah and riqqah); and the coarseness or fineness (ghuldh and diqqah) along with the softness or roughness.