The material is fiberglass-reinforced polyester, as extra strength and stiffness is necessary to make durable products. 

• Side hatches and backdoors have solid double-klick latches.
• There are covers over the inside lock fittings.
• Gas springs provide smooth opening and closing mechanisms.
• The glasses are harden, curved, 5mm thick, slightly darkened and E-marked.
• Most of the models have glued glass in the back door, which gives great stability and strength.
• The hardtop is attached to the pickup bed in a way that you avoid drilling into the car.
• There is a gasket between the bed and the top, so the hardtop will not damage the car.