E-A-R Classic Plus Foam EarplugsFlame-retardant. Foam is non-irritating. Moisture resistant. Offers the highest NRR available. Shape prevents shifting and keeps effectiveness of noise seal constant. Slow recovery PVC foam provides comfort with low pressure. Color: Yellow; Noise Reduction Rate (NRR): 33 dB; Packing Type: Poly Bag; Quantity: 200 pair per box; Type: Corded; Weight: 0.01 lb.