PlugsSafety two piece co-molded design uses two different durometers to achieve an ultra comfortable fit with a stiff core for ease of insertion. Triple flange design insures proper fit. Very competively priced. TPU insert provides easy attachment to all PlugsSafety products. Extremely durable TPE allows for extended life of the earplug. NRR 25/SLC80 18, Class 3/SNR 29.