Real low silver Scotch and Soda Magnetic by Tango Magic (half dollar and English penny)
If you want to use silver coins, this is a great and affordable option, the half dollar coins from 1965 to 1969 were made with silver outside and copper inside, these are called Low Silver Coins.
This the magnetic scotch and soda with the cheapest real silver coin available in half dollar.
You get access to Tangopedia, a video gallery with several scotch and soda routines and hundreds coin magic effects.
