3M™ PELTOR™ Earmuffs X1/ X2 Probed Test Cushions work with the 3M™ PELTOR™ X Series X1 and X2 Earmuffs (sold separately) to allow for fit testing with the 3M™ E A Rfit™ Dual Ear Validation System. These cushions are used specifically with the 3M™ PELTOR™ X Series X1 and X2 Earmuffs to help employers determine the level of protection the earmuffs are providing. Adapter clips hold microphones next to earmuffs for proper positioning during testing. Case includes two pair of probed cushions and two pair of adapter clips. Workers can bring the 3M™ PELTOR™ X Series earmuffs they are using in the workplace, have the operator remove and inspect their cushions, replace them with the appropriate probed test cushions, and be fit tested.