FP-104 High Performance Audio RCA Connectors (Eutectic cast brass central pin/Locking Collet type) 24k Gold plated 4 Pcs / Set • Eutectic cast brass α (Alpha) center pin • Brass body and locking collet • Teflon insulation • Connections: Soldered • Specified for cable diameters up to 8.3mm • Dimensions: 13mm ± 0.1 diameter x 5.5mm ± 0.1mm overall length