Instruct: Classify Amazon reviews into positive or negative sentiment
Query: you could make these yourself

You do need a collar with your wax warmer to deal with the mess. However, if you want to save money and re-cycle and re-use, I suggest holding onto thin weight cardboard that comes with various packaging and simply use one of these collars as a pattern and make your own. If you don't have the time or the inclination to do this, then these collars are not too expensive and work well. I am just one who will save on the imprint to the environment (shipping, production of the item etc...etc...) and make my own out of re-purposed materials.