3M Skull screws corded earplugs p1301, 120 pairs grab the attention of your young workers with these radically designed push-to-fit corded foam earplugs, And help boost hearing proection and compliance at the same time. features: tough look of threaded metal, But feel of soft foam push-to-fit style means no earplug roll-down required foam tips stay clean, Even when your hands are dirty noise reduction rating nrr of 30 db csa class al