 The mass is mounted on two trunnion roller bearings and a large saddle, which not only connects it with the turret bu also blocks off the turret opening.Both the hull and the turret shell of the SP70 are made of aluminium and meet the requirements for protection against 7.62 mm armor-piercing rounds, 14.5 mm armor-piercing rounds at 100 meters and shell fragments from a 152 mm shell bursting at 10 meters.The NBC seal is provided by a mantlet and mantlet seal.