Seven degrees of space is a series of sanitary napkins for young women launched by Hengan Group. Sanitary napkins are absorbent substances, and the main materials are polymer and polymer composite paper formed by cotton, non-woven fabrics, paper pulp or the combination of the above materials.

Sanitary napkins are divided into three layers, namely, surface layer, absorbent core and bottom layer. The adhesive on the back of the sanitary towel is an impermeable material, which can keep menstrual blood in the sanitary towel to absorb menstrual blood flowing out of the vagina when women have menstrual cramps. Women's menstrual resistance is very poor, and not paying attention to nursing will cause various abnormalities in the body.