The Klein Tools P100 Respirator Set includes the 60552 M/L Half-Mask Respirator and four replacement filters (Cat. No. 60554). When paired with the replaceable P100 filters, this respirator is approved in accordance with NIOSH to provide protection against solid and liquid particulate aerosols such as dust, fumes, and oil mist. The slim profile minimizes interference with safety glasses for maximum visibility on the jobsite. Replaceable P100 filters are low-profile and easy to change as needed. For more than 160 years, Klein Tools has manufactured premium-quality, professional-grade hand tools that deliver the performance, durability and precision needed to get the job done right. Our family of engineers, workers and craftsman continue to put six generations of expertise into every tool we create by using only the highest quality materials, superior workmanship, and keeping manufacturing as close to home as we can. Klein isn't just the name of our company, it's also our family name. And since we're an American company that's family-owned and family-run, you know you can count on us to be here tomorrow. Klein Tools doesn't just make great products, we make great products that stand up to the demands of the professionals who use them every day ... Since 1857.