Speaker cable L-4,

2x4mm² OFC braid 0.12mm

2,95 / mtr 
The 0.12mm pure OFC copper (oxygen-free-copper) has the lowest electrical resistance.
Steer clear of cheap CCA cables = copper clad aluminum = Aluminium with a thin outer copper coating. The conductivity is considerably lower, so the electrical resistance for lengths over 5 meters swallows power and the damping factor of the amplifier is reduced, which deteriorates the sound. 

Speaker cable L-4, 2 x 4 mm² OFC strand 0.12 mm

70 meters on the roll