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The Quasar is built for big arms who need control into the wind. This hefty beast wants to fade hard, but it'll get way down the fairway before crashing out. Best for high-powered throwers and sidearms.
Zero-G Quantum is Millennium's application of the Innova Blizzard Technology. These Zero-G models have tiny air bubbles in the plastic (sometimes the flight plate, but typically moreso in the rim) that bring the overall weight down. This allows for the same stability as heavy discs while allowing for an easier throw. These are great for advanced players as well as lower-powered throwers.