Replacement Ear Muff Pad Kit Includes (2) Foam Inserts (2) Replacement Ear Cushions Compatible with Grainger Part Number 21DE16 21DE21 Cushion Material Foam Polyurethane PVC Noise Reduction Rating 28 dB Compatible with Manufacturer Model Number X3A X3P3E Compatible with Brand 3M PELTOR Dielectric No Compatible with Series X-Series X3 Standards CE Approved Cushion Color Black Electrically Insulated Yes Insert Color Black Insert Material Foam