A few years ago I attended a Handwriting Without Tears workshop. This is an exciting curriculum that teaches students about proper ways to write. This activity is the stamp and see work. The student places the card on the magnetic board and uses the magnetic lines and curves to form the letter. When they take the card off the letter is on the board and then they can trace the letter with the magnet pen.
Check out the Handwriting Without Tears website for more information about the curriculum and their workshops.