Synthetic ruby fills the cap of the Tempest, where the balls store heat and superheat the air passing between them. The set contains about 50 pieces at 3 mm, enough to fill the cap with some to spare.
Ruby is lighter than the standard zirconia, with a cap fill weight of 2.8 g against 4.1 g, and it passes heat on far more quickly. In practice that means a shorter warm-up, punchier draws and clear flavour, which is why ruby balls are the most popular first upgrade.
The material is tough and holds up to repeated heat cycles. A ball retaining screen in good condition holds the fill in place, and the C-tool makes the twist-lock easier to work.
Intended for use with: Tempest 2.
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