Compatible models: Not for Jabra Evolve 20 30 40 65 75 and Evolve2 series. Only compatible with certain headset models listed in the description. Compatible with Supra Plus Encore HW251N HW261N HW510 HW520 Blackwire C225 C310 C320 3210 3310 3315 3325 and Jabra PRO 920 930 9400 9460 9 9465 9470 BIZ 620 1100 1500 2300 2400II GN 1900 2100 2025 9120 9125 UC Voice 550 750 etc. A Perfect Fit: These 58mm/2.28 inch replacement ear cushions only for headsets Jabra Yealink YHS33 Series Sennheiser SC 60 USB ML SC 75 SD Pro2 Cyber Acoustics AC-104 AC-204 AGPTEK Arama MAIRDI Wantek Callez Office headsets and most standard-sized headphones have the same specifications. Please refer to the description below for compatibility. SOFTER AND EASY INSTALLATION: These headset replacement cushions are made of soft, high-density memory foam, specifically designed for long-term comfort with your headphones. No tools required, just a few seconds to completely renew your headset. STRONG DUALITY: Made of high-quality materials, these foam ear cushions not only allow maximum sound from the speaker to reach your ears, but are also highly durable to extend the lifespan of some beautiful headphones.