Surface of HPL, the middle of the aluminum honeycomb core, with the harmonic glue pressed in cold press. Thickness:18 mm(20mm,25 mm)Dimension:1220*1830 mm(according to the customer's demand)Surface treatment:3mm HPLMezzanine:aluminum honeycomb*waterproof,wetproof*rustproof,smokeproof,fierproof*easy to install 18 mm,HPL,aluminum honeycomb core