Plantronics foam black donut ear cushions provide soft, all day comfort when wearing a Plantronics SupraPlus headset. These come 2 per pack. They are suited to: H51, H61, H251, H261, HW251, HW261, H251N,H261N, HW251N, HW261N, HW291N, HW301N or any other headset in the Supra and SupraPlus range. These ear cushions are also a very good replacement for the discontinued Claria headset donut ear cushions. It is recommended that ear cushions be replaced at least every 6 months.