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The Blackwire 500/700 Series Foam Ear Cushions from Plantronics
are a two-pack of soft foam ear cushions that can be used as a spare or replacement cushions for the Blackwire C520/C520-M, C510/C510-M, C720/C720-M, and the C710/C710-M.
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Plantronics Blackwire 500/700 Series Foam Ear Cushions (2-Pack) Review