Transducer Labs, N28BER-A, Beryllium Tweeter.
Tweeters are packed in matched pairs but are priced individually.
These tweeters are made in Washington, USA. They are built to European standards and come in less than most competitive brands.
The Beryllium dome the most recent in a series and is outstanding tweeters. Arguably, the best Beryllium dome available. The voice coil former is aluminum and the faceplate is anodized aluminum and round in shape. A protective grille is available.