What is it used for?

Zerlon Wire is used to hang your frames on the wall.

How do I use the zerlon wire?

Use the zerlon wire to hang your frames according to the weight of the item being placed on the wall.

Note: The rolls have diagrams to show three options of how to affix the wire to your mirror hangers or screw eyes.  Follow the diagrams.

When should I use the #3 versus #4 wire?

#3 wire will hold frames up to 30 lbs.  #4 wire will hold frames from 31 to 60 lbs.