<p>Quantity: 1/5/10</p> <p>Color: Black</p> <p>Application: Outdoor Sports</p> <p>Size: About 11.81 x 6.3 inch</p> <p>Material: Neoprene</p> <p> </p> <p>Installation of Filter:</p> <p>1. Open the mask to expose the interior of the filter valve.</p> <p>2. According to the OPEN directions on the valve, turn the valve counter(clockwise), to separate the valve.</p> <p>3. Remove the filter.</p> <p>4. Replace the new filter, reverse the above steps, clockwise rotation of the valve.</p>