Premier Riser Duct is a flexible, non-metallic, corrugated raceway used for effective cable and fiber optic management within interior raceways. Riser meets UL-(1666) standards safety test for flame propogation height of electrical and optical fiber cables installed vertically in shafts. Premier also meets UL-2024 standards for safety optical fiber cable raceway. Riser Innerduct is offered in 1", 1-1/4" and 1-1/2" 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. Call 866-678-5852 for custom lengths (min. length 100')!