From Amazon
OSRAM Starter Cable 300 A, Jump Leads for Petrol & Diesel Engines, 6/12 V, OSC160, Jumper Cable for ≤3.5 L Engines, Copper-Coated Aluminium, 3 m
Conrad Electronic
OSRAM BATTERYstart STARTER CABLE 300A Jump lead 16 mm² Aluminium (copper plated) 3 m Plastic clamps