This is the 3rd volume of Super Minipla Getter Robo series.
This is a special set of Star Arrow (aka Getter Liger) and Star Poseidon (aka Getter Poseidon). Besides, it also includes the Getter Tomahawk, which is fully compatible with Shin Getter 1. (sold separately in the 2nd volume)
Interchangeable parts enable you to recreate various action poses in the scenes.