Zeta Family Of Rockets

Zeta V
Zeta V was meant to be reusable in early development, but was later ditched due to fuel efficiency problems. It is a fully automated medium lift launch vehicle, meant for easy and fast missions.

Zeta 1
Zeta 1 being a light lift launch vehicle, it is not used for major missions, but is used as a strap on booster for Zeta Heavy.

Zeta Heavy
Zeta Heavy is Insight's first Heavy Lift Launch Vehicle, which can lift 30,000t into low earth orbit (LEO). As for all of the Insight vehicles (excluding Zeta X), it utilizes the Aurora Engine.

Zeta X
Zeta X is a SSTO used for interplanetary travel.