This is from the advanced class...
These are beeswax strips I made from wax I rendered from a hive that died last year. I'm WACKY, KerAYZEE happy about this, but they still have a tendency to build they way "they" want. If it's too goofy I cut out the hard part and straighten the rest. I know I have it in frames, but they're on the top bars.
Of course you don't have to do any of this stuff, it gives the bees a place to hang, and directs them to build in a straight line. Also Michael Bush pointed out the last time I wrote anything about this that it gives a center.
I have some frames I've put in without any wax strips, between the drawn stuff, and haven't had time to experience the difference between "Wax on, Wax off."