Brunswick Onyx Soul Nirvana, released in 2025, pairs the HK22C - ECS Hook Solid Ultra 2.0 cover with an asymmetric New Nirvana Ultra Low RG 4.0+ core. It measures RG 2.48 and differential .054 — low RG (revs up early) and high flare potential, banded on Storm's published scale. It leaves the factory at 500/1000/1500 Siaair Micro Pad.
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No per-weight measurements on record for this model — the headline specs above are the manufacturer's published numbers.
These specs are factory reference for the model, compiled from manufacturer publications and other sources and provided as is. They may contain errors or describe a different production run, and they say nothing about the condition of any individual used ball — surface prep, resurfacing, plugging, and drilling all change how a ball behaves relative to its published numbers. Spotted something wrong? Tell us at support@rerackbowling.com.
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Closest on the three specs that compare across brands — RG, differential and symmetry. One ball per line, so no other version of the Onyx Soul Nirvana appears here.