Clarity multiple-use earplugs improve safety and communication by blocking hazardous noise while allowing voice and signal frequencies to be heard more naturally. Designed for long-term comfort, an SMT membrane regulates the transmission of sound frequencies through the earplug and ear canal. Noise reduction rating: 21 dB. Available in two sizes: regular and small. { $2; www.howardleight.com, 800-430-5490 }