Matrix, Uncorded 33 dB Earplugs 200 Pair/BoxMatrix Uncorded Earplugs, 33 dB. Sold 200 Pair Box. Patented no roll design makes insertion easy. Smooth outer skin and reduced diameter provide long term comfort. Delivers instant protection, no need to wait for foam to expand. Screens harmful noise out, it lets voice pass through. Manufacturer: Howard Leight Product Name: Matrix, Uncorded 33 dB Model: EARMX33U Marketing Information: 200 Per Box. Patened no roll design makes insertion easy. Smooth