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Not all crosshairs are created equal. When searching for a setup, you need to consider three scientific principles: Contrast, Visibility, and Centering.
Master the crosshair, master the version, and dominate the server.
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In the base vanilla game (without mods), customization is limited:
Most "PvP Texture Packs" come with a custom crosshair.
Preferred by many "PotPvP" players, as it helps visualize the area where a splash potion might land.