Package: You will get 100 pcs Filters （They are wrapped in bundles of 10） which is quite enough for daily use.<br><br>Fliters Size:12x 8 cm/ 4.7 x 3.1. reasonable size for most of masks.<br><br>5 layers Filter Material: 2 layer of soft skin friendly cloth, 1 layer Activated Carbon cloth and 2 layer Efficient filter cloth as in picture. Wide applications: Activated Carbon Filter anti dust, smoke, pollution, ash, gardening pollen and so on, suitable for most occasions.<br><br>Note: Replacement Filters, recommend replace filter 1-3 days for the best effect. The filter paper insert can not be washable.<br><br>Multipupose: Great for Outdoor Activities such as cycling, walking, hiking, jogging, running, skiing, snowboarding, skateboarding, scooting etc.