1.  Made of fire-retardant PVC material and helix steel wire

2.  The both ends with the black sleeve and the buckle

3.   Easily to connect due to flexible

4.  Enduring the high temperature and oleic acid

5.  Acid & alkali resistant and corrosion resistant and fire resistant

6.  Schlep easily wherever exhaust and inhalation the air in the field condition due to light weight

7.  Prevent the workers from the suffocating by improving dust air into fresh air.