The so-called Standard Model of Particle Physics, which is strongly supported by extensive experimental results, suggests the material universe is assumed to be built by a small number of fundamental particles: quarks. electron-like particles called leptons.

Are leptons made of quarks?

Since leptons are their own constituents, not made up of quarks or gluons, that implies that there is only two ways a neutrino will interact: gravitationally and weakly (however neutrinos generally have such small mass, that gravitational effects are negligible).

Is a lepton smaller than a quark?

Two classes of particles, called quarks and leptons, are thought to be the smallest building blocks of the universe. ... Physicists at Fermilab's Tevatron and CERN's LEP and LHC colliders have set a limit on the size of quarks and leptons, which is that they must be smaller than about 0.001 times the size of a proton.