Characteristics and specifications New foam for the seat's flip-up armrest and microfiber weaving Butterfly reclining mechanism 100 mm Class 3 gas lift (SGS test) 320mm nylon base with a maximum pressure of 900 kg without movement 50mm PU wheels (maximum test of 80,000 cycles) Adjustable range of gas lift: 100mm Size of wheel base: 640 mm Adjustable head rest 8cm up and down Arm rest flip-up 78°, recline 40° forward and backward 2 cm