Premier Conduits Riser Innerduct is a flexible, non-metallic, corrugated raceway used for effective interior cable and fiber optic management. Premier Riser meets UL-(1666) standards safety test for flame propagation height of electrical and optical fiber cables installed vertically in shafts. Premier also meets UL-2024 standards for safety optical fiber cable raceway. Premier Riser is offered in 1", 1.25", 1.5" and 2", with pre-installed pull tape for easy cable installation. The standard color is orange and is offered in a variety of other colors. Sequential marked footage is standard. Custom color options are available.