This 3M respirator mask is the perfect solution for anyone in need of a reliable and comfortable mask. With a history of providing up to 40 hours of use, this mask is lightweight and maintenance-free, making it ideal for long-term use. The mask is made by 3M, a trusted brand in the industry, and is designed to meet the highest standards of quality and durability. This unit comes in a single size and is perfect for both personal and professional use. Whether you need a mask for work or personal protection, this 3M respirator mask is the perfect choice.