What are much smaller in size then electrons and neutrons And they move very quickly?

The particles that are much smaller than electrons and neutrons are called quarks. Quarks are fundamental constituents of protons and neutrons, and they combine in various ways to form these larger particles. They are known for their extremely small size and are always found in groups due to a phenomenon called confinement. Additionally, quarks move at high speeds, especially when influenced by the strong force that binds them together.