... service life, high strength, lower influence of circumstance, non-deforming, exquisite appearance etc. Roller Blinds System Clutch: 38mm Aluminum ... is against UV, aging, brittleness and distortion. Helper Spring System When the chain roller blinds is wide and high or ... property is much better. 3. stainless chain bead: High strength, better drape property, lower influence of circumstance, more durable, ...