Polyester material reinforced with Aramide (Kevlar). Vulcanized with hot temperature under pressure in one operation. Non-slip surface providing maximum friction when stacking two lifting bag. Sizes: 320 x 520 mm. Thickness: 25 mm. Lifting capacity: 12 t. Max. stroke: 200 mm. Max. air requirement: 96.3 L. Max. inflation pressure: 8 bar. Test pressure: 12 bar. Weight: 4 kg.