Traditional or K style. High capacity: 6 In. rainfall per hr. 10 Ft. lengths. Lightweight! Easy to install! No sealants or caulking! No special tools! Hooks required. Do-It-Yourself System will not crush, dent, rust or corrode. Durable vinyl! Engineered to withstand North America's worst conditions (-40? to 150?F or 65?C) including ice or desert heat. Heating cables ok. Maintenance-free! Never needs paint! Cleans with a hose!