1 Inch inner diameter nylon wire loom tubing. Used to protect main harnesses and power connections inside engine compartments and along the chassis. Temperature rating of -40° to 300° F, (-40° to 149° C). Gray identifying stripe indicates the higher temperature capability. Nylon is more durable than standard wire loom, and resists oil, grease, and fuel. Full length slit makes it easy to get your wires inside the loom, and to split out branch circuits as needed. The corrugated design provides the tension needed to keep the slit closed even in the tightest of bends. Excellent abrasion protection. Made in Canada.