Snap-on lens magazines for North CF7000 series abrasive blast respirators contain 4 layers of high-quality lenses, so you can remove an abraded layer and keep working with clear sight. The package contains 48 four-lens cartridges that are designed to let you remove lens layers even when wearing thick gloves., Distortion-free optics with a wide range of vision is just one of the proprietary features Honeywell engineered into the North CF7000 series to help abrasive blast workers stay safe, comfortable, and productive in challenging environments. The lightweight combination system offers less noise, durable and flexible hood, and easy switch from supplied air to an air-purifying respirator.