From the website:
T-26 obr 1939 Light Tank Company (SBX22) includes five T-26 obr 1939 Light Tanks & one Tank Commander sprue.
The first thing required by the theorists was a breakthrough of the enemy front line. The idea was that massed light tanks would advance with the infantry, destroying enemy machine-gun nests and pinning down the enemy riflemen, allowing the infantry to capture the enemy trenches. This required a relatively cheap and simple design that could be fielded in large numbers. Fortunately, the Vickers-Armstrong company were offering exactly such a design with their 6-ton Type E tank.