Matrix features a super soft outer skin – a perfect match for the sensitive skin in the ear canal. And its smaller diameter low pressure foam eliminates that stuffy, plugged up feeling so familiar to earplug wearers. Matrix is the only single-use earplug in the world that screens harmful noise out, but lets voice frequencies in. This means workers can hear each other much better on the job, enhancing communication, safety, and overall compliance. Matrix also comes in three distinct attenuation profiles, to specifically match any application. MTX-1-OR Orange, has a NRR 29dB rating. MTX-1-GR Green, has a NRR 27 dB rating. MTX-1-BL Blue, has a NRR 23 dB rating. Packed 200 uncorded pair per box, 100 corded pair per box.