It is a 6-feet long TUV certified 6mm Cable with MC4 connectors.  It can carry at least 40 Amps and 1000 volts. 

Strand Design No./Dia. (84/0.3mm)  Conductor Resistance 20°C/KM (≤3.39Ω)  Outer Diameter (7.1mm)  Rated Current at 20°C (57A) 

Conductor (Stranded Tin Plated Copper)  Insulation/Sheeth (XLPE)  Rated Voltage (1000V)  Temperature Range (-40°C~90°C) 

Halogen Free  (Yes)  UV Resistance (Yes)  Mini Bending Radius (6x Outer Diameter)