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Like all sub-atomic particles, quarks do not have a radius in any meaningful sense. In other words, they are NOT like ball bearings for which you can say, "At this distance from the center of the quark, you are inside the particle, while further out you are no longer inside the quark." At the level of a quark, to speak of its size is to discuss a property with no meaning.

Quarks do have mass, but they contribute very little mass to the particles that are made up of quarks. Most of that comes from gluons.

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