100% PVC-Free. Highest Independently tested to ANSI S3.19-1974 with a NRR 33. Tapered for easy insertion in any size ear canal. Improved, softer foam for maximum comfort. Non-irritating smooth surface. Longer length for easy fitting and removal. The bright green color is a trademark of Moldex-Metric, Inc. and also provides easy compliance checks. Hygienically packaged in biodegradable paper pouches (#6800 only). Independently tested to ANSI S3.19-1974. , Safety Products. Ideal for food processing applications.