Advanced "no-roll" yellow foam tips and blue paddle-style grips to make getting a good fit easier than ever. Surgical-grade, stainless steel ball bearings embedded in the grips provide metaldetectable quality control. Cord is not metal detectable. Reusable Pillow Pack helps keep earplugs clean when they are not being worn. Yellow plug with blue cord. NRR: 25 dB. 100 pair/box; 4 boxes/case.