Product review (3 stars): two different quality rack guards
I ordered two sets of these guards.  When they arrived I had one set of rack guards that came packaged in a bag that were white and thin, and one single one packaged on a piece of cardboard that was shorter but much thicker and off white.  After contacting Amazon I did receive another one to complete the set.  My problem is they are two different qualities.  The longer ones are much thinner and don't protect against the heat as well as the shorter ones do.  I tried them side by side in my oven.  Then, because I was giving a set to my daughter-in-law, when I washed them, the longer, thinner ones shrank and now it doesn't fit as well on the oven rack.  I have owned a set of these for years and I loved them.  Other reviewers are right that these darken and stain over time, but they do such a good job that it doesn't matter.  However, I bought another set because I have a new stove and wanted new ones to put on the racks.  I am very disappointed that when ordering a replacement for myself and a set for my daughter-in-law that I got two much different products.  There is no picture of the guards when you order them, so you have no idea if you are getting the good ones or not.  If I hadn't already owned a set and had only ordered one set I wouldn't have known the difference, but I do know how the good ones work.  I am disappointed that either the company is changing their quality, or Amazon just doesn't distinguish between the two when you order them.  I would give the better set (model number B000QJDCKU) a 5 star rating if I had received two sets of those.