I bought too many, so I'm listing them. Quoted from the website below: Easily alter curtain sizes with just an iron. Size (approx.): Width 3.5 x Length 300 cm Estimated quantity needed (for our curtains): ・Curtain width 100cm x 2 panels... 1 bag of this product ・Curtain width 100cm x 2 panels (double pleats)... 2 bags of this product ・Curtain width 150cm x 2 panels... 2 bags of this product [Precautions for use] ・On coarse or thin fabrics, the adhesive resin may ooze out. ・Some fabrics have a glossy surface, are coated, or are otherwise difficult to adhere to. ・Be careful not to let the hemming tape come into direct contact with the iron. ・After ironing, do not move the fabric until it cools down to ensure proper adhesion. ・Cannot be used on fabrics with an "ironing not allowed" symbol. ・Tumble drying is not allowed. (The hemming tape may peel off and adhere to the drum.) ・If the hemming tape peels off after washing, it can be reattached by ironing. ・Cannot be adhered to acrylic materials.