Tree shape with string 25dB earplug use for air 1.NRR:25dB 2.High workmanship,washable,with rope 3.CE/ANSI approved Tree shape with string 25dB earplug use for air What's the Features? Smooth,light weight,soil resistant skin is non-allergenic and non irritating,eliminate pressure on the ear canal,make your ear feel comfortable in long-term usage process,washable,no deformation,green initiative, ...