Even for used items, technical specs determine market value. Confirm the material composition (e.g., 100% Polyester, Velvet, or Blackout coated) as this affects weight and shipping costs. Ask for size distribution charts—standard widths and lengths (e.g., 250cm drop) are easier to resell. For Blackout Curtains, verify if the thermal coating is peeling or cracking, as used coated fabrics are prone to degradation. Lastly, confirm the packing method, typically compressed bales of 45kg to 100kg, to optimize container space.