The curved tapered shape helps make insertion easier. The expandable polyurethane foam provides excellent attenuation and comfort as it self-adjusts inside the ear. The smooth, non-allergenic surface provides comfort and helps eliminate dirt contamination for better hygiene. Available in two sizes, Regular and Plus, providing optimum comfort and protection to any size ear canal. Available corded or uncorded. NRR 32dB. Tested to ANSI S3.19-1974 standard. 200 pair per box. Sold by the box.