COMPATIBLE MODELS: NOT for Jabra Evolve 20 30 40 65 75 and Evolve2 Series. 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 2300 2400II GN 1900 2000 2100 2025 9120 9125 UC Voice 550 750, etc. But For other headsets, please contact us for Compatibility Guide. A PERFECT FIT: These ear cushions replacement ONLY fit headsets Plantronics 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 Headset and Most standard size headphones perfectly with the same specification. For compatibility list in details, please refer to description below. SOFTER / EASY INSTALLATION: Used the soft high-density memory foam, Plantronics ear pads replacement are specifically designed for long-term comfort with your headphones. No tools required, ONLY taken a few seconds to renew your headset completely! NOTE: Please push the lager loop of new earpad fully in. RUGGED DURABILITY/ DOUGHNUT STYLE: With holes and the doughnut style, these headphone ear covers not only allow maximum sound to the ear from the speaker, but have strong durability to extend the life of some very good headphones.