Coasters, you need them, but instead of buying them, you can make them.
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Step 1: Materials
Cork roll or sheet
Hot glue gun or super glue
Knife or scissors
-i just happened to have only a pink hot glue gun
Step 2: The Cork
Cut the cork so a row or 5 by 5 of pennies can fit
You can just put the pennies on the cork then cut
If you bought a roll of cork and plan to glue before cutting, then put something heavy on the edges.
Step 3: Glue
Glue the first 25 pennies to the cork
Glue in rows, do not glue a square out side them fill in
Step 4: 2nd Layer of Pennies
Glue the last 16 pennies so it is a 4 by 4 square
Make sure the pennies are in the middle
Step 5: Final Touches
Using your knife or scissors, trim the original square base so you cannot see the cork