Abstract
A new composite model in which two types of fundamental fermions exist is proposed. These consist of light quarks ${q}_{B}$(u,d) and new lepton quarks with fractional charges (-(2/3), (1/3)) and a lepton number L=(1/3) such that leptons are composites of three lepton quarks (3${q}_{L}$) while nonstrange baryons are 3${q}_{B}$ composites. In addition, heavy quarks are obtained as ${q}_{B}$${q}_{L}$q${\ifmmode\bar\else\textasciimacron\fi{}}_{L}$ composites which throw interesting light on the mechanism of heavy-quark decay modes.
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