Material:
1. Made of fire-retardant PVC material and helix steel wire and Need not be automatic sprang open stretch.
2. The both ends with the black sleeve and the buckle
Atructure and character:
A strong, durable, lightweight sewn ducting product. Used time is longer. Is both portable, flexible, compressible and retractable down to 1/7th of its fully extended length – depending on the pitch and fabric selected. The encased steel-wire helix construction prevents collapsing and crushing of the duct, while remaining resistant to abrasion, fatigue and deterioration from weather and chemical influences.
