Instruction: Generate an answer to the question by utilizing the information contained in the document.

Input:
Question: I've just noticed there seems to be two clips on the ends that mine do not have.  Is this right?
Document: First, the price is only for one filter, not two. I ordered "2" thinking I would get four panels, but only two arrived. That's just a clarification. However the quality is poor as is the packaging. The two filters showed up loose in a box stuffed with paper. One of the frames on one of them arrived broken, I've been trying to piece it together, but I'm concerned it will come apart in my furnace and hit the electrostatic air cleaner.
These replacement pre-filters are too small (height-wise). To compensate, the seller has added little spring clips on the top to fit properly.
The fiber density is better than the original factory filters that were installed in my furnace. Air Flow is much improved. Make sure the clips are on the bottom or there will be a gap at the top. There are no markings or directions telling you this that I saw but you can see it if you install them clips up.Have had them in a month during a very cold winter so cleaned the yesterday.
I ordered this to replace the factory one that is WELL past it's prime. I have not had any issues and have noticed a better, stronger, and cleaner air flow since changing out. Fits my furnace perfectly and is about 1/4 the cost of the factory one. I'll be buying more! :)
These filters were almost identical to the originals - but when sliding them into the slot they did not go in far enough to allow snapping the cover on. I measured and measured and compared them to the originals - they seemed almost identical and I could not see where there was any interference but the cover would not snap in place to allow the unit to activate until I forced them in and deformed the frames of the filters.
Ordered these because it listed equivalent model numbers and actual size to verify. When I received them, they for perfectly. Without listings of model numbers and actual size I probably wouldn't have ordered them.
On the positive side, the seller was very responsive in expressing their concern and provided a prompt refund.
Even if there are directions, who keeps them and you clean them at least every 3 months and who would look for them to read them. Yes, I did notice the gap but some people would not and a lot of furnaces are in low light areas.
Density of filter material not up to the standards of others I have purchased. Will not purchase from this vendor again.
Answer: Yes - I believe they help keep the filter in place. Provide pressure so it fits completely