Fit the decorating bag with tip 16 and fill 1/2 full with medium consistency icing. Hold the bag at a 45° angle at 3:00 (9:00 for left-handers). Hold the tip slightly above the surface.
For right-handers: Squeezing out icing with even pressure, curve tip down and around to the right as if writing a "c".
Left-handers will pipe c's by starting at the bottom edge squeezing and moving up to left and around.
Repeat to complete the border, using a steady, even pressure.
To end, stop pressure, pull tip away.