Multiple laminates and thicker glass increases the strength. Bullet-resistant glass is usually constructed using polycarbonate, thermoplastic materials, thermoset EVA, and layers of laminated glass. A similar glass is often used in airliners on the front and side cockpit windows, often three plies of 4 mm toughened glass with 2.6 mm thick PVB between them. This is one of the makeups used for the Boeing 747 cockpit side windows. The BAC/SAF Concorde forward pressure windshields had 7 plies, 4 glass and 3 PVB total thickness 38 mm.