The EAR-055-100 from Williams Sound is a 100 Pack (50 Pair) of Replacement Ear Pad Covers (Black) for use with:
Williams Sound HED-040 : Hearing Protector - Dual Headphones Williams Sound MIC-068 : Heavy-Duty Dual Muff Headset Williams Sound WIR RX15-2 : SoundPlus 2-Channel IR Receiver