Mega Bullet Biosoft Earplugs Class 5 Corded 100/boxThe worlds first sustainable bio based earplugs made from 82% bio based materials Will decompose 76% in 180 days Disposable foam earplugs, 100% PVC free Tapered shape for easy insertion & removal, with a slow, controlled rebound time Independently tested SLC80 33dB Class 5 When stored in its original packaging, Biosoft maintains the same shelf life as standard PU foam ear plugs