The OX-ON H2 Comfort hearing protector for helmet attachment is made from strong, impact-resistant ABS material. The unique design of the oval cups provides a perfect fit with good internal depth, leaving plenty of room for the ears. Soft sealing rings ensure optimal covering for the ears. This hearing protector is for helmets with a 30 mm slot - suitable for the most common helmets on the market. The spring steel in the helmet attachment is made from stainless steel and ensures that pressure is congenial. This makes the item comfortable to wear, even for long periods. This lightweight hearing protector has an SNR (signal-to-noise ratio) of 30 dB. High frequency: 31 dB Medium frequency: 28 dB Low frequency: 21 dB Lightweight at just 300 g. This hearing protector is suitable for environments with moderate to high noise levels.