ProChoice Probell Metal Detectable Earplugs Corded 

Class 5, SLC80, 27dB,Disposable, PU foam,Hearing protection for noise levels to 110dB(A),Internal metal ball and blue colour are easily detected by visual and automated inspections,Blue metallised polycord prevents earplugs from falling into sensitive production lines and is fully detectable should the plug become separated from the cord,Superior design makes it easier to insert and reduces tendency to back out of the ear,Pairs packaged in individual poly bags