Foam ear cushions designed for: Plantronics H251 H251N H261 H261N HW251N HW261N H91 H91N, Jabra, Biz, PLX, SP Spirit headsets, Yealink, etc, and most standard size 60mm office telephone headsets.NOT for Jabra Evolve 20 30 40 65 75 and Evolve2 Series. The doughnut design: allows maximun sound to the ear from the speaker. The earpads covered with a layer of leather is more comfortable to wear. The nylon mesh cover to prevent dirty. BINGLE Replacement Ear Cushions are designed for ONLY COMPATIBLE WITH SOME SPECIFIC HEADSETS MODELS LISTED IN DESCRIPTION. Some specific models from Plantronics Supra Plus Encore HW251N HW261N HW510 HW520 Blackwire C225 C310 C320 3210 3220 3310 3320 3315 3325 and Jabra PRO 920 930 9450 9460 9465 9470 BIZ 620 1100 1500 1900 2400II GN 1900 2000 2100 2025 9120 9125 UC Voice 550 750, etc，and a portion 50mm standard size office telephone headsets.NOT for Jabra Evolve 20 30 40 65 75 and Evolve2 Series. Easy to install: take off the old earpads and put on the BINGLE earpads. You also can watch the video to install. Trustworthy After-sales Service:Package Quantity: 10pcs, 2pcs microphone windshield foam cover free.BINGLE offers you 45 days free replacement and 12 months warranty. If you need any help, we are happy for you to reflect the problem to us by email. Bingle Ear Cushions Foam Replacement for Plantronics Supra Plus Encore and Most Standard Size Office Telephone Headsets H251 H251N H261 H261N H351 H351N H361 H361N (4 Pack)(BEC-FM4)