Builder's Best 010131 V430 Readi-Pipe Flexible Semi Rigid Aluminum Dryer Vent Duct, 4-inch by 8-foot with 2 Clamps N/A Made in US 8-foot length dryer vent duct with two clamps for wall and dryer connections Class 0 non combustible flexible duct Soft cuff ends connect with clamps to standard 4 inch connections Recommended by dryer manufacturers Made in the USA out of 100% aluminum