The Howard Leight Thunder protective earmuff is packaged 1 per box, comes in green and meets 2003/10/EC - EU Hearing Directive, 29 CFR 1910.95 - OSHA Occupational Noise Exposure (US), 89/686/EEC - EU Directive/PPE, ANSI S12.6-1997 - Method B - Attenuation Test Protocol (BR), ANSI S3.19-1974 - Attenuation Test Protocol (US), EC Category PPE 2, NOHSC: 1007 (2000) - National Standard for Occupational Noise (AUS/NZ), NR 15 - Security and Health of Work, Annex 1 & 2, n°3.214/1978 - Occupational Noise Regulations (BR), NR 15 - Security and Health of Work, n°3.214/1978 - Occupational Noise Regulations (BR), Z94.2-1994 - Attenuation Test Protocol (CAN) standards.