3M 1100 NRR29 tappi per le orecchie monouso senza fili sacchetto da 100 paia
NRR29: Noise Reduce Rate 29. 3M 1100 UF foam ear plugs are the stiffest of the poly-urethane foam ear plugs. For those who like the feel of UF, but want the stiffness of PVC (which makes insertion easier), the 3M 1100 is a good choice.