Line cookie sheet with parchment paper, set aside. .
Place light or dark cocoa melting chocolate in a microwave-safe bowl, melting in 30 second increments, stirring after each.
Once melted, cover most of the pretzel with chocolate, and place on a parchment-lined cookie sheet. Let the chocolate dry.
In another microwave-safe bowl, place white melting chocolate and melt in 30-second increments, stirring after each.
Spoon into a piping bag and cut off a small tip. On dry pretzel rods, pipe on the laces. Let dry and serve!