Related research shows Use sanitary napkin for 2 hours, menstrual blood is exposed to air will produce a large number of bacteria, thereby endangering women's health.For health reasons, 80% of women in the developed world for nearly 30 years Europe and the United States use tampons, if you change sanitary napkin more than 2 hours, we strongly recommend that you use tampons! For the first time use tip: 1.For the first time use trial, please start from minimum flow type (light), suggest changing sliver 2-4 hours, the longest time not more than 8 hours; Will clear after 2.Familiar with suitable for cotton of their flow and change the time, don't worry; 3.According to statistics, 80% of the women to try 2-3 to master the using method, did not succeed the first time, please do not give up. Specification: Material:Plastic+Cotton Quantity: 16Pcs/Box Size:length12.5cm/4.92in Notes: 1. Manual measuring, please allow 1 ~ 3mm error,thank you. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. We guarantee the style is the same as shown in the picture.