Unistrand 7 2 xx a unscreened defence standard multicore 61 12 part 4 unistrand 7 2 25a a multi core unscreened type a flexible cable that have fine tinned copper wire strands colour coded pvc insulation cores twisted together and a pvc outer sheath unistrand 100m 7 2 25a defence standard unscreened signal cable 25 core