The Green Fiberglass Reinforced Polyester U-Channel are durable and lightweight. These u-channels are a great replacement to wood in structural applications. Temperature Range: -60° to 140° F Tensile Strength: 7,000-30,000 psi Hardness: Barcol 45 (Hard) For Use Outdoors: Yes Straightness Tolerance: 0.050" per ft. Wall Thickness: 1/4 Inch Wall Thickness Tolerance: -0.025" to 0.025 Inch Outside Height: 1-5/8 Inch Outside Width: 6 Inch Inside Height: 1-3/8 Inch Inside Width: 5-1/2 Inch Length: 5 Ft. Material: Fiberglass Reinforced Polyester Color: Green