STANDARD EAR MUFFS : 

The ear muff is designed to protect from the hazard harmful noisy.   Comes with soft foam cushions which provides comfort seal to the skin and will not lead to allergy.  Lightweight and suitable for industrial workers who need to wear ear muff for a long time per day.   Recommended for landscaping, construction and power equipment operators.  Features low cost but good performance.
Additional foam pad for headband also available (model no. SM-303W). 

Foam cushions replaceable

Pass : CE EN352-1, ANSI S3.19 test
SNR: 26dB, NRR: 23dB
 

Frequency HZ	125	250	500	1000	2000	4000	8000
Mean Attenuation DB	9.8	16.3	23.9	31.3	36.1	46.3	44.5
Standard Deviation DB	3.6	2.6	3.1	2.6	2.6	3.8	2.8
SNR=26dB; H=34dB; M=23dB; L=14dB