Castline Gold patch cable 3.5mm TRS-straight to 1/4" TS-straight summing left and right channels from single stereo output to mono input with resistors (1k ohm). Mogami Neglex 2549. This cable is needed to connect MP3 players, portable CD players, cell phones, and other devices which have 1/8" (3.5 mm) TRS output to amplifier, mixer, PA systems and other devices wich have 1/4" (6.35mm) TS input. Also, this cable prevents sound distortions and equipment damage. Cables assembled in the USA All cables were tested with cable tester. Available in 1Ft; 2Ft; 3Ft; 6Ft; 10Ft; 15Ft; 20Ft; 25Ft; 50 Ft. Custom Length Available per Your Request. Connector: - Model: Castline CT109G Stereo - 3.5mm TRS Stereo Gold Plated Tip (for maximum connectivity) - Heavy Duty Design. - Model: CT103G Mono - Castline 1/4" TS Gold Plated Tip (for maximum connectivity) - Heavy Duty Metal Construction. Cable: - Mogami W2549 Neglex Balanced Wire. Made in Japan - 2 Coper Conductors -22 AWG - Cable Diameter: 6.0mm (0.236") - Flex Life: 14500 Cycles. - Tensile Strength: 657 N