The Tracker Earplugs offers exceptional hearing protection without the bulk of earmuffs, making it perfect for woodturners who need to wear a face shield or anyone seeking a lightweight alternative to earmuffs. With a hidden metal bearing for X-ray or metal detector tracking, these earplugs are ideal for the food processing industry aswell. Certified to AS/NZS 1270 Class 4 with a 22dB noise reduction rating, The Tracker combines safety, comfort, and convenience, all stored in a durable hard case."