These gel ear cushions can be used to replace worn or damaged rings or provide enhanced comfort when wearing hearing protection. Easily clicks into place to extend the life of your 3M Hearing Protector. Designed for WorkTunes Connect (90543), WorkTunes Connect + Gel Cushions (90544), Peltor Sport Shotgunner II (97040), Bulls Eye (97041), Ultimate (97042), Tactical 300 (TAC300), Tactical 500 (TAC500), 3M Pro-Grade (90565), 3M Pro-Grade Hi-Viz (90566)