1.inner tube 168/219/275mm (optional) 2.rising height 600mm (optional) ... : 3~4 second 4) Falling time: 2~3 second 5) Inner tube diameter: 219/273mm (D) 6) Rising height: 400-1000mm ... stadiums , amusement parks , airports, shopping centers , hospitals , and apartment complexes. auto remote road traffic Hydraulic bollards for safety