Features 100% PVC-Free®. Highest independently tested NRR – NRR 33 for regular Meteors® and NRR 28 for Meteors®, Small. Soft, slow recovery foam and contoured shape molds easily to the ear canal for all day comfort. The contours follow the shape of the ear canal which means less pressure at the smallest diameter of the earplug. Meteors® innovative undercut design affords a secure fit, all day long. Meteors® are independently tested to ANSI S3.19-1974. Look for the Meteors®bright green color as a symbol of Moldex quality. Look for the Meteors® , Small exclusive colored streaks and swirls as a symbol of Moldex quality.