Note: 100g luminous cotton covers an area of 10-20 square meters. These Halloween fake spider webs need to be placed in the sun or light during the day to absorb energy for a period of time, and only emit green fluorescence in the dark at night. They are decorative and stretchable, made of artificial fiber material, soft and lightweight, and can be applied for a long time. They are scary decorations for Halloween parties, theme parties, role playing parties and more.