Uncorded low-pressure single-use earplugs for superior comfort.</br>Low pressure polyurethane foam earplug expand gently for long-term comfortable wear.</br>Contoured T-shape is easy to handle and wear.</br>Smooth?? soil-resistant closed-cell foam skin to prevent dirt build-up.</br>NRR30. Replacement for Leight Source 400.</br></br>Product Description</br></br>Uncorded low-pressure single-use earplugs for superior comfort. Low pressure polyurethane foam earplug?expand gently for long-term comfortable wear. Contoured T-shape is easy to handle and wear. Smooth?? soil-resistant closed-cell foam skin to prevent dirt build-up. NRR30 Color:?Green</br><br/>http://www.amazon.com/gp/product/B0035XGRVU