This VERE Optical Breadboard has 1/8" thick Ferromagnetic skins laminated to a nonmetallic honeycomb core. The core has 3/8" honeycomb cells with inherent broadband energy absorption, eliminating the need for additional internal dampers to suppress the resonance found in metal cores.  Self damping side panels.  Entire unit is coated with a Black Polyurethane, Anti-Reflective finish.

Featuring 1/4-20 holes on a grid spaced 1" center to center. 

Photo is generic of this product line.