Write a short note on Hockey Stick.

Hockey stick: the instrument used to hit, push and control the ball in hockey. 1. It has a curved head and a handle, and the ball may be played with its flat side only. 2. It is made of wood, fibreglass, carbon fibre or a composite material. 3. Its weight is not more than 737 g. 4. It must be able to pass through a ring of internal diameter 51 mm. 5. It must have no sharp or rough edges, and be covered with a smooth finish.