Made with 1-3/8" inner dimension 1-5/8 outer dimension anodized aluminum. The unbendable pipe is great to customize your side rails or add that extra cross bar. If you need lengths broken down into certain sections, please specify in the comments section when placing an order. Sold by the foot. CONSTRUCTION: Nominal Pipe Size (NPS) 1 1/4" Schedule 40, 6061-T6 anodized aluminum pipe Class III anodizingHigh strength-to-weight ratio Outside diameter = 1 5/8" Inside diameter = 1 3/8" Wall thickness = 1/8"Weight = 12.6 oz/ft