Level 1: For work with a significant amount of dust in order to isolate work sites, dust masks that correspond to high concentration of dust and properly use protective cloths, etc., this level requires severe exposure protection. Level 2: Remove products with low specific gravity and are easy to dust and require high exposure prevention in accordance with the level 1. Level 3: For working with relatively low dust generation, this level requires dust protection based on the level of dust in crushing, cutting, etc. Size: L Material: Tyvek, Weight: 6.3 oz (190 g), Manufacturer: Azaus