http://www.energykitesystems.net/FAA/FAAfromMakani.pdf :
Page 3:
M5 Specs
Rated power: 5 MW
Full rated power wind speed: 9 m/s
Wing mass: 9,900 kg
Generation system: 8 brushless DC motors
Wing
Wing spar: carbon fiber
Wing skin: e-glass
Length: 1,060 m
Tether
Mass: 3,660 kg
Conductor: aluminum
Structure: pultruded carbon fiber
Voltage: 8 kV
Tether weight: 3.45 kg per meter for the 5 MW wing.
M600 Specs
Rated power: 600 kW
Full rated power wind speed: 9m/s
Wing mass: 1,050 kg
Generation system: 8 brushless DC motors
Wing
Wing spar: carbon fiber
Wing skin: e-glass
Length: 440m
Tether
Mass: 250 kg
Conductor: aluminum
Structure: pultruded carbon fiber
Voltage: 8 kV
Tether weight: 0.57 kg per meter for the 600 kW wing.