All our models suggest quarks are fundamental particles, along with electrons, neutrinos, photons and such. It is probably important to say that we don’t model quarks and such as particles but waves, all matter is waves in quantum fields.
These models are very good, they can predict the results of experiments to 15 decimal places.
There is a minimum size too, the plank length, around 10^(-34)m, for reference, imagine a proton was 1m across. Then this minimum size is the size of a proton within the 1m-proton.
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