Just as Ghost uses the Ghost Eyecons to harness the power of Great Heroes, the Ganma use their own version of the Eyecons to materialize. Premium Bandai has announced a Ganma Eyecon Set, due for release in March, 2016. Besides the month of release, nothing else is known about the set.
More information will be released when the set goes up for order on December 4th, 2015. This set is limited to 5,000 units total, and once the limit is reached, pre-orders for the set will close.
Source: Premium Bandai