“Named after Klimenti Voroshilov, the People’s Commissar for Defence, the KVs proved a nasty surprise for German tank crews during the early days of Operation Barbarossa. Although slow, they were extremely heavily armoured.” 
Good, no-nonsense tanks, I reckon. Having seen one myself it is indeed an impressive machine .
Trumpeter 1/35 kit . This kit – of the first production tanks in the KV series – is just one of many KV variants which Trumpeter have produced  .
1. KV-1 & 2 Heavy Tanks 1939–45, Steven J Zaloga & Jim Kinnear, Osprey Publishing, 1995 (link)