Hertz DCX 87.3 coaxial speakers (87 mm).

Hertz DCX 87.3 (DIECI series) 2-Way Coaxial Speakers 3.5" (87 mm).

The DCX 87.3 is a coax combining a woofer made of the highest performance materials with a neodymium tweeter featuring the exclusive PEI dome. 
Despite its compact size, the DCX 87.3 features an oversized magnetic group for ultimate control, still maintaining a compact size. 
For those who look for a high performance two-way coax, the DCX 87.3 is able to ensure wide frequency response and excellent sound in any installation.