The Mini Split, 1/4 Liquid Line, 3/8 Suction Line, 35 foot line set is seamlessly constructed of high quality copper and backed by over 75 years of rigorous standards and testing Length: 35'; Liquid Line Size: 1/4"; Mfg. #: 40680350B3B6; Suction Line Size: 3/8"; Wall Insulation: 3/8";