Filtered and double flanged. 24dB NRR. Patented EarLock rings for unparalleled retention. Hypoallergenic soft polymer construction. Detachable lanyard. Can be used as an earpiece for compatible radio communication systems. Filters reduce loud noises while allowing conversations to be heard. Color: Black. Size: Medium (1") fits most people and is based on the ear's concha bowl. Clam packed.