Health Care Particulate Respirators and Surgical Masks help provide respiratory protection against certain airborne biological particles. These are disposable and fluid resistant to splash and spatter of blood and other infectious material. As disposable particulate respirators, they are intended to help reduce wearer exposure to certain airborne particles including those generated by electrocautery, laser surgery, and other powered medical instruments. As a surgical masks, they are designed to be fluid resistant to splash and spatter of blood and other infectious materials. Size: Regular, One Size Fits Most. Box of 20.