SOMMER TRICONE INSTRUMENT CABLE Where unbalanced single conductor cable is to be used in unpredictable situations then this Session cable is a major contender. The outer diameter is 6.0 mm because the inner conductor is surrounded by a very low loss foamed dielectric to minimise high frequency loss in high impedance circuits. The dielectric is then surrounded by a carbonised plastic antistatic tube which stops crackles when the cable is moved. Again, high impedance circuits would suffer without this antistatic tube. Dense spirally wound copper strands form a 100% shield against interference and helps maintain a supple cable. Still supple down to -30 C. Sold by the metre.