7mm granite laminated with 1mm fiberglass backing, totally 8mm thick Largest size: 1400x2800mmWeight: 5.13 pounds/sq.ft (25kg/sq.m), 2/5 weight of 2cm granite slabApplication: Interior wall, elevator, ceiling, bus,boat,etcAdvantage: Reduce the weight and shipping cost, easy to install, save time and labor cost