Corded Detachable "DYNA-FIT" Disposable Earplugs | 100 Pairs | Dynamic Meets ANSI S3.19-1974 Regulation & Canadian Class A(L) Standards NRR 32dB Bright Blue-with cord, 1 pair per bag, 100 bags per dispenser box The Dynamic "DYNA-FIT DETECT" NP101CD is a copy of the "DYNA-FIT" NP101C to the exception that it is detectable due to the addition of a metal insert connected to the cord. This product was made for the food industry and for that reason its color is of a bright blue which make it easier to trace if by accident it falls into food production areas. The Dynamic "DYNA-FIT DETECT" is safe, comfortable with a high NRR rating easily detectable due to its metal insert and its bright blue color plus it is very economical. The blue connecting PVC cord makes this product practical to wear and limits the risk of process contamination.