> 4m (13.12 ft) folding arm, each of the two sections of the arm is 2 m (6.56 ft); Length of the main section of barrier arm can be adjusted, but cannot be less than 1 m (3.28 ft); The arm is made of high-strength aluminum alloy, and the folding arm mechanism uses stainless steel rectangular tube; Hollow elastic anti-smashing rubber strip at the bottom of the arm; A red reflective film is attached to the surface of the white barrier arm.