Key Features Adjustable Nose clip. Quick and easy to wear. Packs of 50 in a sealed bag Ultrasonically welded headbands. Soft inner lining. No need to pre-stretch straps. Size: 175mmx95mm/ 6.8"x3.4 inch Material Composition Nose clip- aluminum. Straps - Thermoplastic Elastomer. Shell- Non woven SS 50G/M2. Bacterial filter efficiency >95.00% Country of Origin Made in the USA with globally sourced materials. Shelf Life and Storage 5 years from the date of manufacture Store in temperatures between -4AdegF, (-20AdegC) and +86AdegF (+30AdegC)