PURE SOUND Bass Instrument Cable. Connectors: 1/4" Straight Jack on each end Most shielded cables have only one shield. The BI-12 has three and by carefully choosing exacting materials - such as 99.999% oxygen free pure copper and PTFE die-electric insulation - you will unleash the true tone from your bass that you never thought was possible. You will not believe the difference this cable will make with your tone.