The Poly EncorePro HW530/540 Small Leatherette Ear Cushion is a replacement cushion for the Poly EncorePro HW530 and HW540 headsets. It provides a way to replace a worn cushion while keeping the headset in use.
This is the small-size version, made from leatherette. The cushion slides onto the headset speaker, so it fits as an ear-contact replacement part rather than a complete headset. Its listed diameter is 35 mm.
The part is identified as HP 85R23AA and Poly 88833-01. Package contents: one leatherette ear cushion.