This is a 1" screw on style compression driver using a special PETP film diaphragm that provides an extremely smooth top end without the harshness commonly found in metal diaphragms

• Optimized acoustic and magnetic design achieves outstanding clarity and reliability

• A one-piece, PETP film diaphragm and surround optimizes energy transfer for greater efficiency

• Patented clamping system yields low distortion performance while improving the mid-band response

• Polyimide-insulated, copper-clad aluminum voice coil is edge wound on a glass-fiber former producing lower distortion and superior power-to-weight ratio

• A matched wave front phase corrector produces a coherent sound wave at the horn throat, yielding detailed and dynamic mid and high frequency response

We received a large qty of these in a liquidation deal.  Get this great sounding driver at an amazing price - While supplies last