I was not expecting amazing with clips. I bought 1 set per a.c. unit and it held the ends down but the middle would still let some stuff go by which is not the clips fault. So i bought 1 more set per unit to clip the middle also. I use 4 clips per side and my filters work as intended. For the money and what it does im happy with it.
WARNING: This product can expose you to chemicals, which is known to the State of California to cause cancer and reproductive harm. For more information, go to www.P65Warnings.ca.gov.