What are thin and thick myofilaments made of?

Composition of thin myofilaments:

The proteins in thin filaments are actin, tropomyosin, and troponin.

Composition of thick myofilaments:

Thick filaments are composed of protein myosin only.

There are three different types of myofilaments: thick, thin, and elastic filaments. Thick filaments consist primarily of the protein myosin. Each thick filament is approximately 15 nm in diameter, and each is made of several hundred molecules of myosin.